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Kryton Krystol T1 is a surface-applied crystalline waterproofing slurry: a gray or white cement-based powder you mix with water and brush onto concrete. It’s built for basements, foundations, pits, tanks and other structures that face water pressure, and it can go on either the wet or the dry side of a wall. It’s one of the better-documented products of its type, but it’s a professional-grade, caustic material that takes careful prep and curing.
| Type | Crystalline waterproofing slurry coating (cementitious) |
| Chemistry | Cement-based powder with Krystol crystalline chemicals; zero VOC |
| Finish | Thin gray or white cement coating |
| Coverage | Up to 225 sq. ft. per 55 lb pail; up to 45 sq. ft. per 11 lb pail (one standard coat) |
| Coats | One or two; second coat within 48 hours after the first sets hard |
| Working/set time | About 30 minutes working time; hardens in about 5 hours (68°F, 50% RH) |
| Cure | Wet cure at least 3 days (7 for potable water tanks) |
| Application temp | Air and surface at least 40°F |
| Best for | Basement walls, foundations, elevator pits, tanks, pools, retaining walls |
| Not for | Moving cracks or joints; flexible or non-concrete surfaces |
| New concrete | Works on new or existing concrete |
Watch: Kryton Krystol T1 in 60 seconds
What It Is / How It Works
Krystol T1 (the older "Krystol T-1" spelling still shows up on some listings) is still sold by Kryton International, which updated its application instructions in April 2026. Unlike a liquid sealer, it's a thick cement slurry. Once applied to damp concrete, its crystalline chemicals migrate into the pores and react with water and cement byproducts to grow insoluble crystals. Those crystals block the pores and capillaries water would otherwise travel through. Kryton lists a crystal growth rate of 2–10 mm per week.
Kryton publishes more test data than most products in this category. Per its data sheet, Krystol T1 resisted 140 m (460 ft) of hydrostatic head in a U.S. Army Corps of Engineers CRD-C48 test, reduced water penetration depth by about 90% versus untreated concrete in another CRD-C48 test, and self-seals hairline cracks up to 0.5 mm (about 0.02 in). It's also NSF/ANSI/CAN 61 certified for contact with drinking water. These are lab results under controlled conditions; Kryton itself notes it can't warrant field results because site conditions and workmanship vary.
Where It Works Best (and where it doesn't)
Kryton lists basements and foundations, elevator and equipment pits, parking structures, pools, reservoirs and tanks, tunnels, manholes, bridge decks and retaining walls. The standout feature for homeowners is that it works from the negative (inside, dry) side. If you can't dig out a leaking foundation, you can apply it to the interior face of a poured concrete wall.
It's limited to rigid concrete. Kryton says it may not be reliable on moving cracks or joints, so active cracks, cold joints and pipe penetrations need repair first using Kryton's repair procedures. It's also not a decorative finish. On floors subject to wear or where appearance matters, Kryton recommends a Krystol T2 topcoat. If your problem is surface water rather than water under pressure, a penetrating sealer from our best waterproofing concrete sealers guide may be simpler.
Pros
- Works on either the positive (wet) or negative (dry) side of a wall
- Extensive published test data, including high hydrostatic resistance
- Self-seals hairline cracks up to about 0.5 mm
- Zero VOC and certified for potable water contact
- Becomes part of the concrete rather than a membrane that can tear
- Can be painted, plastered or tiled over with the right prep
Cons
- Professional-use product that is caustic when wet; needs gloves, goggles and long sleeves
- Demanding prep: open-pore concrete, saturated-surface-dry condition, leaks and cracks repaired first
- Must be wet cured for at least 3 days
- Not for moving cracks or joints
- Low coverage per pail compared with liquid sealers
- Surface bloom must be washed off before painting
How to Apply It
- Stop active leaks and repair cracks, faulty joints, pipe penetrations and honeycombing first, following Kryton's repair instructions.
- Open the surface by high-pressure water blasting (3,000 psi or more), scarifying, shot blasting or sandblasting. Remove paint, sealers, form release, dirt and laitance. Avoid acid etching; if you must use it, neutralize and rinse thoroughly.
- Soak the concrete, then remove standing water so it's saturated-surface-dry (damp, no sheen). Rewet ahead of your work as needed.
- Apply only when air and surface are at least 40°F. Mix about 3.5 parts powder to 1 part water by volume to a thick, spreadable slurry, and mix only what you can use in about 20 minutes.
- Brush, broom or spray it on at 2.2–3 lb per square yard.
- For a second coat, wait until the first sets hard (usually 6–24 hours) and apply within 48 hours. Rinse off surface bloom and keep the first coat damp.
- Cover with plastic or tarps, then wet cure for at least 3 days. Protect from rain, frost and traffic for 24 hours.
How It Compares
Kryton Krystol T2 contains the same crystalline chemistry with fewer actives but a more durable finish. Kryton recommends T2 as a topcoat over T1 on floors and visible surfaces.
Super-Krete S1300 Pene-Krete is a spray-on liquid that's easier to apply and is marketed for reducing moisture vapor and priming slabs for coatings. It publishes far less test data, and it isn't positioned for active water pressure the way Krystol T1 is.
Silane/siloxane penetrating sealers are liquid water repellents for exterior concrete. They're much easier to apply and keep a natural look, but they're not designed to resist hydrostatic pressure from the negative side. See our best silane siloxane concrete sealers for that category.
FAQ
Does Krystol T1 work on the inside of a basement wall?
Yes. Kryton says it can be applied from the positive (wet) or negative (dry) side. Leaks and cracks still need repair first, and moving cracks may not stay sealed.
Can you paint over Krystol T1?
Yes. Wash and rinse off the surface bloom, roughen loose particles and use a paint suitable for new concrete. Kryton's FAQ recommends priming with a penetrating primer, such as a non-pigmented 100% acrylic latex, because the surface can leave a dusty residue.
Will Krystol T1 seal cracks?
It self-seals hairline cracks up to about 0.5 mm (0.02 in). Larger or moving cracks need separate repair.
How soon can I backfill?
After the coating has set hard. Kryton's FAQ suggests about 24 hours, then inspect and touch up. If backfilling within 3 days, use damp backfill material.
Verdict
Krystol T1 is a serious, well-tested crystalline waterproofer and one of the few products that can treat a leaking poured-concrete wall from the inside. It's backed by more published data than most competitors. The catch is the work: aggressive prep, saturated-surface-dry application, three days of wet curing and careful handling of a caustic material. Done right, it's a strong option. Our rating: 4.3/5
How we reviewed this product: this is a research-based review built from the manufacturer's technical data sheet and current retail listings. We have not run our own hands-on tests of this product. Details were checked in October 2026; always follow the current label.
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QUIKRETE Acrylic Concrete Cure & Seal (No. 8730) is a water-based clear acrylic that does two jobs. On fresh concrete it works as a curing compound, and on new or existing concrete it seals the surface. It’s widely sold and inexpensive. It works well on DIY pours and for a light satin refresh on driveways, walks and garage floors. With only 20% solids it builds a thin film, and that film needs careful, even application and periodic recoating.
| Type | Membrane-forming curing compound and topical sealer |
| Chemistry | Water-based acrylic copolymer, 20% solids |
| Finish | Clear satin (QUIKRETE also calls it semi-gloss) |
| Coverage | Curing: 200 sq ft/gal. Sealing: 150–200 sq ft/gal depending on texture and porosity. |
| Coats | Curing: two thin coats at right angles. Sealing: an even coat with no puddles. |
| Dry/recoat | Leave the surface uncovered for at least 24 hours after application |
| Cure | No rain, heavy dew or temperatures below 50°F for 24 hours |
| Best for | Curing fresh DIY pours; sealing driveways, sidewalks, garage floors, loading docks |
| Not for | Sealed, painted or non-porous surfaces |
| New concrete | Yes. Meets ASTM C309; apply once the bleed-water sheen is gone. |
Watch: QUIKRETE Cure & Seal in 60 seconds
What It Is / How It Works
QUIKRETE describes 8730 as a "dual purpose water based clear acrylic coating." It's still sold under the same name, in 1-gallon bottles and 5-gallon pails, and some retailers list it as "Commercial Grade." On fresh concrete, the acrylic forms a membrane that slows evaporation so the slab holds its water and cures properly. That can replace wet curing, which helps in hot, dry or windy weather. It meets ASTM C309, the standard for liquid membrane-forming curing compounds, when applied at 200 sq ft per gallon.
On older concrete, the same film works as a sealer. QUIKRETE says it repels water and resists acids, grease and salt. At 20% solids the film is fairly thin, so expect light protection and a modest satin sheen, not the heavy wet look of a high-solids solvent acrylic.
Where It Works Best (and where it doesn't)
It's at its best on a fresh DIY slab, sidewalk or pad, where one product cures the concrete and leaves a sealed, clean-looking finish. It's also a reasonable low-cost refresh for clean, porous driveways, walkways and garage floors.
It doesn't belong on concrete that's already sealed or painted, or on dense surfaces that won't absorb it. QUIKRETE specifically excludes non-porous, sealed and painted surfaces. Colored concrete is tricky because uneven application shows up as uneven color. If your main goal is protecting a driveway from deicing salt and freeze-thaw damage, a penetrating repellent is usually the better tool. See our best driveway sealers.
Pros
- Cures and seals in one product; meets ASTM C309
- Water-based, cleans up with water
- Easy to find and inexpensive per square foot
- Goes on with a garden sprayer, roller, brush or broom
- Owners commonly report easy application and an even, clean finish
Cons
- Low 20% solids means a thin film with modest durability
- Over-applying or puddling causes appearance problems
- Some owners report milky, blotchy or frothy patches, including whitening when the sealer gets wet
- Can't go over sealed, painted or non-porous surfaces
- Pine and citrus cleaners can discolor the finish
- The data sheet doesn't give a dry or recoat time for sealing
How to Apply It
- Check the weather. Don't apply if rain, heavy dew or temperatures below 50°F are expected within 24 hours. Keep the product from freezing in storage.
- For fresh concrete: Apply after finishing, once the surface sheen is gone and bleed water has soaked back in. That's typically 4–6 hours after placing, 2–3 hours in hot, windy weather and at least 10–12 hours in cool weather.
- Curing coats: Spray two thin coats at right angles with a garden sprayer, at about 200 sq ft per gallon. Brush out any puddles.
- For existing concrete: Remove oil, dirt and contaminants. For heavy soiling, QUIKRETE suggests its Concrete & Asphalt Cleaner or Oil Stain Remover, then a rinse. Repair or remove flaking concrete, and make sure the surface is dry and porous.
- Sealing coat: Apply with a broom, brush, roller or garden sprayer at 150–200 sq ft per gallon. Don't exceed that coverage rate or leave puddles, and keep the coat even, especially on colored concrete.
- Protect it. Leave the surface uncovered for at least 24 hours. Clean sprayer nozzles and tools with water right away.
How It Compares
Eagle Satin Seal is a similar water-based satin acrylic aimed at broom-finished concrete. Eagle publishes coverage by surface type and foot-traffic times, but it doesn't claim ASTM C309 curing performance. QUIKRETE is the more practical choice on fresh pours.
Solvent-based acrylics, such as Eagle Supreme Seal, give a richer wet look and higher build, but they have strong odor and much higher VOC. On a garage forum thread about QUIKRETE sealer whitening in the rain, one contractor said they had moved away from water-based acrylics for that reason.
Penetrating silane/siloxane sealers leave no film to wear off or whiten, which makes them a better long-term choice for exterior flatwork once the slab has cured. See our best penetrating sealers.
FAQ
Can you use QUIKRETE Cure & Seal on new concrete?
Yes, that's one of its main jobs. Apply it once the surface sheen is gone, typically 4–6 hours after placing, in two thin coats at 200 sq ft per gallon.
Why did my Cure & Seal turn white?
Whitening usually means the film didn't form properly. Common causes are applying too heavily, puddling, moisture in the slab, or rain or dew before it dried. QUIKRETE warns against exceeding the coverage rate and against applying with rain or dew expected within 24 hours. If the problem keeps coming back, contact QUIKRETE before you add more coats.
Is QUIKRETE Acrylic Cure & Seal waterproof?
It repels surface water, but it isn't a waterproofing membrane and isn't rated for hydrostatic pressure. For damp basement walls, look at a dedicated masonry waterproofer. See our waterproofing sealer guide.
Can you put it over an old sealer?
QUIKRETE says the surface must be porous and able to accept more sealer, and it shouldn't go on sealed or painted surfaces. If water beads on the slab, the old sealer is still there.
Verdict
QUIKRETE Acrylic Concrete Cure & Seal is a handy, low-cost product for curing a fresh DIY pour and leaving it with a light satin seal. On older concrete it's an acceptable budget sealer, as long as you apply it thin and even, in good weather. The low-solids film doesn't last long, and owners report occasional whitening, so it's not the top pick for long-term driveway protection. See QUIKRETE's product page for current details. Our rating: 3.6/5
How we reviewed this product: this is a research-based review built from the manufacturer's technical data sheet and current retail listings. We have not run our own hands-on tests of this product. Details were checked in October 2026; always follow the current label.
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Euco Diamond Hard from Euclid Chemical is a water-based liquid densifier and sealer that combines a silicate hardener with a siliconate water repellent in one product. It is built for commercial and industrial floors, polished concrete and warehouse slabs, but it also gets used on garage and shop floors by owners willing to follow a contractor-style application. The bottom line: it is a well-documented, near-zero-VOC densifier that adds some liquid repellency and a gloss that builds with traffic, but the application is unforgiving, and leftover material dries to a white residue that has to be ground off.
| Type | Penetrating densifier/hardener and sealer |
| Chemistry | Water-based blend of silicate and siliconate |
| Finish | No film; troweled floors develop a sheen over time with traffic and buffing |
| Coverage | 200–250 sq ft per gallon on steel-troweled concrete |
| Coats | One continuous application, kept wet at least 30 minutes |
| Dry/traffic | Light foot traffic 4–6 hours; wheel traffic 24 hours (70°F) |
| Cure | Protect from rain 12 hours; dry buff for gloss after 24 hours |
| VOC | 5 g/L or less |
| Temperature | 35–100°F air temperature |
| Best for | Warehouse, retail and industrial floors, polished concrete, interior or exterior slabs |
| Not for | Use as a curing compound; DIYers who cannot remove all excess |
| New concrete | Cure 7+ days, clean, then air dry at least 24 hours |
Watch: Euco Diamond Hard in 60 seconds
What It Is / How It Works
Euco Diamond Hard is still sold under the same name, in 5-gallon pails, 55-gallon drums and 275-gallon totes. It is clear, water-based and ready to use. Euclid describes it as a product that "penetrates, chemically reacts, and bonds within the surface," which is how silicate densifiers work: the silicate reacts with calcium hydroxide in the concrete to form extra calcium silicate hydrate (CSH) in the pores, making the surface harder, denser and less dusty.
What sets it apart from a plain silicate is the siliconate. Euclid says the siliconate forms a water-repellent polymer inside the surface, so the product densifies and seals in one step without changing texture. Euclid makes the point itself when comparing it with its sodium silicate product, Eucosil, which contains no siliconate and therefore gives no liquid repellency.
Euclid's current data sheet lists lab results that back this up. In RILEM water absorption testing, treated concrete absorbed 1 mL of water in 24 hours versus 5 mL untreated. Abrasion resistance (ASTM C779) improved by about 40% at 30 minutes and 27% at 60 minutes. Slip resistance also rose slightly, with wet static coefficient of friction going from 0.77 untreated to 0.82 treated. Those are manufacturer figures, but they are specific and tied to named test methods.
Where It Works Best (and where it doesn't)
Euclid lists warehouse, commercial and retail floors, manufacturing plants, distribution centers and diamond-polished concrete as typical uses, on new or existing concrete, inside or outside. Coverage is given for steel-troweled concrete, and the product is happiest on dense, smooth floors where the gloss can develop with traffic. On a homeowner level, that translates to garage floors, shops and basements where you want less dusting and better resistance to spills without a coating that can peel.
It is not a curing compound and does not meet ASTM C309 or C1315, so it should not replace proper curing on a new pour. It also needs a clean, uncoated surface: old cure-and-seals, paint, coatings, oil and wax must be removed first. Overspray can mark metal, glass, wood, paint and brick. And Euclid's chemical-resistance advice is to test on site if chemicals are a concern, so do not treat it as a substitute for an epoxy in a shop that handles harsh chemicals. If you need a true barrier coating, see our best epoxy floor coatings.
Pros
- Densifies and adds water repellency in one product
- Near-zero VOC (5 g/L or less), water-based, water cleanup
- No surface film to peel, scratch or wear off
- Published abrasion, absorption and slip-resistance test data
- Wide application range (35–100°F)
- Gloss builds over time on troweled floors; works in polished concrete systems
Cons
- Excess left to dry leaves a white residue that only grinding or sanding removes
- Labor-intensive: keep wet 30 minutes, scrub, break up gel, remove all excess
- Tracking product onto untreated concrete can leave permanent marks
- Not a curing compound
- Sold in 5-gallon and larger containers through contractor suppliers
- Will not hide stains or add color; not a chemical-resistant coating
How to Apply It
- New concrete: cure at least seven days with a wet or sheet cure or a compatible curing compound, remove the curing method and laitance, then let it air dry at least 24 hours. Existing concrete: remove cure-and-seals, paint, coatings, dirt, oil and wax.
- Apply when the air is 35–100°F. In hot weather, pre-dampen the slab and apply once standing water is gone. Below 50°F, expect slower gelling and keep it wet longer.
- Protect metal, glass, wood, paint and brick nearby. Rinse overspray right away with clean water.
- Spray with a low-pressure sprayer or pour and spread with a broom or squeegee, at about 200–250 sq ft per gallon. Scrub it in with soft-bristle brooms or an auto-scrubber.
- Keep the surface wet with product for at least 30 minutes, adding more to areas that absorb quickly.
- When it thickens and gels underfoot, mist lightly with clean water to break up the gel and push excess onto the next area. Do not track it onto untreated concrete.
- Remove all excess at the end. Protect from rain for 12 hours. Allow light foot traffic after 4–6 hours and vehicles after 24 hours. For immediate gloss, dry buff with a lambswool pad after 24 hours.
How It Compares
Lithium silicate densifiers (for example L&M Lion Hard): lithium products are typically applied much thinner (Lion Hard lists 600–800 sq ft per gallon on dense concrete) and Lion Hard's directions call for a shorter 15–20 minute wet time and removing dried residue with a broom or buffer rather than flushing. They do not include a siliconate repellent, so they rely on the densified surface alone.
Sodium silicate densifiers (for example W. R. Meadows Liqui-Hard or Euclid's own Eucosil): similar coverage and hardening, but no built-in repellency, and Liqui-Hard's directions call for flushing the floor with water at the end.
Silane/siloxane sealers: stronger water and salt repellency, especially outdoors, but they do not harden the surface. Our guide to the best penetrating concrete sealers covers both types.
FAQ
Is Euco Diamond Hard a sealer or a densifier?
Both. The silicate densifies and hardens, and the siliconate adds water repellency. Euclid calls it a "liquid densifier and sealer."
Can I use Euco Diamond Hard on a garage floor?
Yes, as long as the concrete is bare and clean and you can follow the full application, including removing all excess. Euclid's literature focuses on commercial floors and does not address garages specifically.
Will it make my concrete shiny?
Not right away on most floors. Euclid says tightly troweled surfaces develop a glossy sheen over time with traffic and cleaning, and you can dry buff after 24 hours for immediate gloss. Broom-finished concrete will stay mostly matte.
What happens if I leave puddles?
Excess material that dries on the surface leaves a white residue that Euclid says requires grinding or sanding to remove. That is the most important thing to get right.
Verdict
Euco Diamond Hard is one of the better-documented silicate densifiers on the market, and the added siliconate gives it real water repellency that plain sodium silicates lack. It is a professional product with a professional application, and mistakes with excess material are costly to fix. For contractors and careful DIYers treating dense interior slabs, it is a strong choice. Our rating: 4.3/5
How we reviewed this product: this is a research-based review built from the manufacturer's technical data sheet and current retail listings. We have not run our own hands-on tests of this product. Details were checked in October 2026; always follow the current label.
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Ashford Formula, made by Curecrete in Springville, Utah, is a water-based, chemically reactive treatment that cures, hardens, densifies and dustproofs concrete. It has been a go-to product for warehouse, plant and commercial floors for decades, and it comes with a 20-year warranty. The bottom line: it’s a proven, zero-VOC densifier with real test data behind it, but it isn’t a sealer or waterproofer, it’s sold through reps rather than stores, and Curecrete prefers qualified applicators.
| Type | Penetrating densifier, hardener, dustproofer and curing aid |
| Chemistry | Water-based, chemically reactive penetrating treatment; zero VOC |
| Finish | No film; troweled floors develop a sheen with traffic and scrubbing over 6–12 months |
| Coverage | About 200 sq ft/gal |
| Coats | One application kept wet for 30 minutes; porous or soft concrete may need more |
| Dry/recoat | Usable once dry to the touch; paint or coverings after 3–7 days (existing) or 30 days (new) |
| Cure | Full benefits typically in 6–12 months |
| Best for | Interior troweled slabs: warehouses, shops, garages, basements, new pours |
| Not for | Sealed or coated concrete, lightweight block, heavy de-icing salt exposure without added protection |
| New concrete | Apply right after finishing (acts as a curing aid) |
Watch: Ashford Formula in 60 seconds
What It Is / How It Works
Ashford Formula penetrates the concrete and reacts with compounds already in the slab, forming crystalline growth that fills pores and voids. According to Curecrete's product data, it also neutralizes alkalis and draws them to the surface, where they're flushed away during application. The result is a denser, harder surface that sheds far less dust.
Curecrete publishes test results that most consumer products don't. These include a 32.5% increase in abrasion resistance (ASTM C779), a 13.3% increase in impact resistance (ASTM C805), 93% greater moisture retention in the first 24 hours of curing, and NFSI High Traction certification for slip resistance. It contains no VOCs, is nonflammable and meets the CDPH indoor air standard.
It leaves no coating, film or membrane. On smooth, steel-troweled floors, a wax-like sheen builds over 6–12 months "strictly as a result of traffic, use and scrubbing," in Curecrete's words. That gradual sheen is one of the things people like most about it, and one reason it's not a quick cosmetic fix.
Where It Works Best (and where it doesn't)
Ashford Formula is at its best on new, structurally sound, steel-troweled interior slabs where dusting and wear are the main problems: warehouses, plants, shops, garages and basements. On new pours, it doubles as a curing aid and can reduce crazing. It also prepares floors for paint, adhesives and floor coverings.
It's a poor match if you want water beading or stain protection on an outdoor slab. Curecrete says areas with heavy de-icer or road salt exposure need extra protection, such as its Salt Slayer product. It can't go over sealed or cured surfaces unless the coatings are fully removed. It won't fix dusting caused by overtroweling, carbonation or a poor water-cement ratio, isn't for lightweight block or highly porous masonry, and won't stop salt migration under heavy moisture or hydrostatic pressure. For water repellency, look at our best penetrating concrete sealers.
Pros
- Permanent hardening and dustproofing backed by a 20-year warranty
- Published ASTM test data for abrasion, impact and slip resistance
- Zero VOC, nonflammable, no film to peel or wear off
- Works as a curing aid on fresh concrete
- Floor gets shinier and easier to clean with use
Cons
- Not a sealer: limited oil, stain and water repellency compared with a topical or siloxane product
- Not sold in home centers; you buy through a Curecrete rep in 5- or 55-gallon containers
- Application is fussy (keep wet 30 minutes, mist, flush, squeegee), and Curecrete recommends qualified applicators on existing concrete
- Sheen and full benefits take 6–12 months
- Can't be used over existing sealers or coatings
How to Apply It
These steps summarize Curecrete's directions for existing concrete. New concrete is treated immediately after finishing, and Curecrete requires a field technician on site when owners apply it to new pours.
- Strip and clean. Remove all coatings, sealers and curing compounds. Sweep or hose the floor. A damp surface is fine if there are no puddles.
- Check the temperature. Don't apply when the slab surface is below 35°F. Mask or protect glass, aluminum and stainless steel.
- Saturate the surface with a low-pressure sprayer, or pour and spread with a soft-bristle broom, at about 200 sq ft per gallon. Never use an airless sprayer.
- Keep it wet for 30 minutes, working it in with the broom. The surface will be slippery during this stage.
- Finish based on absorption. If most of it soaked in after 30–40 minutes, remove the excess from low spots. If most is still on the surface, wait until it gets slippery, then flush with clean water and squeegee dry.
- Return to service. The floor can be used once dry to the touch. Wait 3–7 days before painting or installing coverings.
- Maintain it. Scrub often with water and a pH 9–10 cleaner. Avoid acidic cleaners and sweeping compounds, and don't wax the floor.
How It Compares
Lithium silicate densifiers, sold by many brands, do a similar hardening and dustproofing job, and many are sold online and in home centers in sizes that suit a single garage. Check each product's directions, since application steps vary. Ashford's advantage is its long track record, warranty and published test data.
Silane/siloxane sealers like Rust-Oleum OKON S-40 make concrete repel water and salt, which a densifier alone doesn't do. On exterior slabs in snow country, a siloxane is often the better first choice, or a second step over a densifier.
Epoxy coatings give a garage floor color, chemical resistance and a cleanable surface, but they're a film that can wear and peel. A densifier like Ashford is the opposite: no film, very low maintenance, and the concrete still looks like concrete. Compare options in our best epoxy floor coatings guide.
FAQ
Is Ashford Formula a sealer?
Not in the usual sense. It's a densifier and hardener that leaves no film. Curecrete's warranty says a properly treated surface should stay dustproof, hardened and water resistant, but it doesn't make water bead like a silane/siloxane sealer.
Can I apply Ashford Formula myself?
In the U.S. and Canada, owners can apply it to new concrete with a Curecrete field technician present. For existing concrete, Curecrete recommends a qualified applicator. You can find a local rep through the Ashford Formula website.
How long does it last?
The treatment is permanent. Curecrete warrants that a properly prepared, structurally sound surface will remain dustproof and hardened for 20 years, or it supplies product to re-treat defective areas.
Can I put it on a garage floor that was sealed before?
Only after the old sealer is completely removed. It must penetrate bare concrete to react, so any coating, curing compound or bond breaker has to come off first.
Verdict
Ashford Formula is one of the best-documented concrete densifiers available, with zero VOCs, published test data and a 20-year warranty. It's an excellent choice for dusty or new interior slabs, especially if you can bring in a pro. It's less practical for a DIY homeowner, and it isn't the right product if what you really need is water and salt repellency. Technical documents are on the Ashford Formula website. Our rating: 4.2/5
How we reviewed this product: this is a research-based review built from the manufacturer's technical data sheet and current retail listings. We have not run our own hands-on tests of this product. Details were checked in October 2026; always follow the current label.
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W. R. Meadows Liqui-Hard (product #378) is a water-based sodium silicate densifier and chemical hardener used on warehouse floors, commercial slabs and new concrete. It hardens and dustproofs concrete from within, with zero VOC and no film. The bottom line: it is a proven, low-cost way to stop a dusting floor and toughen a slab, but the application is labor-intensive, with scrubbing and a full water flush, and it adds little water repellency on its own.
| Type | Penetrating densifier, hardener and dustproofer |
| Chemistry | Water-based sodium silicate (20–25% per the SDS) |
| Finish | No film; adds a sheen that can be burnished on steel-troweled floors |
| Coverage | 300 sq ft/gal on fresh concrete; 200 sq ft/gal on existing concrete |
| Coats | One; very porous surfaces may need a second application |
| Dry/traffic | Dry in 2–4 hours; keep foot traffic off at least 4 hours (12 preferred) |
| VOC | 0 g/L |
| Best for | Dusting or soft interior floors, warehouses, shops, new steel-troweled slabs |
| Not for | Anyone wanting a no-rinse, one-step product; stain or water repellency on its own |
| New concrete | Can be applied after final finishing and joint cutting, as a curing aid |
Watch: Liqui-Hard in 60 seconds
What It Is / How It Works
Liqui-Hard is still sold by W. R. Meadows under the same name, in 5-gallon pails and 55-gallon drums. It is a clear, ready-to-use silicate liquid. W. R. Meadows' safety data sheet lists sodium silicate at 20–25% as the active ingredient. Once on the floor, it soaks into the surface and reacts with the concrete to form a byproduct that fills the pores. The result is a denser, harder surface that resists dusting and pitting and stands up better to abrasion.
W. R. Meadows says treated floors gain better abrasion, chemical and petroleum resistance than untreated concrete, better light reflectance and a sheen that can be polished. It lists the test methods it uses (ASTM C779, F150, F609, G155 and Taber abrasion), but the current data sheet does not publish numeric results. It also notes that treated surfaces are USDA accepted, which matters for food plants.
The trade-off is the application: the directions call for keeping the floor wet, scrubbing, re-wetting and then flushing off all excess with water. W. R. Meadows also makes Liqui-Hard Ultra, a lithium silicate version that does not require flushing.
Where It Works Best (and where it doesn't)
Liqui-Hard shines on interior slabs that dust, scuff easily or will see forklift and cart traffic: warehouses, garages, shops and basements. On new concrete it can be sprayed after final finishing and joint cutting as a curing aid, though W. R. Meadows notes that its MEDCURE product may suit freshly placed concrete better in some cases.
It is not a water repellent or stain blocker. If oil spills or road salt are the main concern, you will want a penetrating repellent or a coating on top. The existing surface also has to be clean and free of curing compounds, bond breakers, oil and dust, and hard-troweled floors may need sanding or a diamond pad first so it can soak in. Overspray can etch glass, aluminum and polished surfaces, and any excess that is not flushed off can leave white stains. For water and salt protection, see our best silane/siloxane concrete sealers.
Pros
- Zero VOC, water-based, soap-and-water cleanup
- Hardens, densifies and dustproofs without a film that can peel
- Can be used on fresh concrete as a curing aid or on old concrete
- Resists yellowing, discoloration and traffic marks
- Treated surfaces are USDA accepted
- Sheen can be burnished on steel-troweled floors
Cons
- Labor-intensive: keep wet 30–60 minutes, scrub, re-wet, flush and squeegee dry
- Excess left on the floor can cause white stains
- Little water or stain repellency on its own
- Lower coverage on existing concrete (200 sq ft per gallon) than lithium densifiers
- Overspray can etch glass and aluminum
- Shorter shelf life (about one year) and must not freeze
How to Apply It
These steps are for existing concrete, the most common homeowner use. Check the current label for the concrete temperature limits, which are listed in the precautions.
- Clean the floor of oil, bond breakers, curing compounds, dust and anything else that will block penetration. Sand, grind or use a diamond pad on hard-troweled surfaces if needed.
- Rinse with water and let the surface dry completely. Protect glass, aluminum and polished surfaces nearby.
- Saturate the floor with undiluted Liqui-Hard using a sprayer, squeegee or broom, at about 200 sq ft per gallon.
- Keep it wet for 30–60 minutes, adding product to dry or porous spots.
- When the surface gels and turns slippery, mist lightly with water and scrub with a broom or floor scrubber. Keep working for another 5–10 minutes until it gels and gets slippery again.
- Flush thoroughly with water while brooming, then mop or squeegee off all excess. Re-flush any slippery spots and squeegee until dry.
- Allow 2–4 hours to dry and keep foot traffic off for at least 4 hours, ideally 12. Very porous floors may need a second application.
How It Compares
W. R. Meadows Liqui-Hard Ultra: the company's lithium silicate version. It covers more area (450–800 sq ft per gallon on existing hard-troweled floors), needs only a 5–10 minute dwell time and requires no flushing. That makes it much simpler for a DIY crew.
Euclid Euco Diamond Hard: a silicate/siliconate blend that adds water repellency on top of densifying. Coverage is similar (200–250 sq ft per gallon), and it also demands careful removal of excess, but it does more to resist water and spills than a plain sodium silicate.
L&M Lion Hard (LATICRETE): a lithium silicate densifier at 600–800 sq ft per gallon on dense concrete, with a 15–20 minute wet time and no water flush. For most DIY garage floors, a lithium product is the easier path. See our best penetrating concrete sealers for more.
FAQ
Is Liqui-Hard sodium or lithium silicate?
Sodium silicate. W. R. Meadows' SDS lists sodium silicate at 20–25%. The lithium version is sold separately as Liqui-Hard Ultra.
Does Liqui-Hard waterproof concrete?
No. It densifies and hardens the surface, which can reduce how quickly liquids soak in, but it is not sold as a waterproofer or water repellent.
Can I put a sealer or coating over Liqui-Hard?
W. R. Meadows says to clean the surface before applying any subsequent coatings. Also check the coating maker's prep requirements, since many coatings have their own rules about densified or treated concrete.
Why are there white stains after applying it?
W. R. Meadows says that failing to wash off all excess material can cause white stains. Flushing and squeegeeing the floor dry is a required step, not an optional one.
Verdict
Liqui-Hard is a dependable, zero-VOC sodium silicate hardener that does exactly what it says: harder, denser, less dusty concrete. It is a good value on large interior slabs and for crews used to the scrub-and-flush routine. For DIYers, the lithium alternatives, including W. R. Meadows' own Liqui-Hard Ultra, are easier to get right, and anyone who needs water or stain repellency should look elsewhere or add a sealer. Our rating: 3.8/5
How we reviewed this product: this is a research-based review built from the manufacturer's technical data sheet and current retail listings. We have not run our own hands-on tests of this product. Details were checked in October 2026; always follow the current label.
Related Guides
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Super-Krete S1300 Pene-Krete is a spray-applied, zero-VOC penetrating densifier for concrete and masonry, sold mainly to contractors as a slab treatment and coating primer. It’s aimed at people who want to reduce moisture vapor, dusting and freeze-thaw damage before a topcoat goes down. Its marketing claims are bold, but its published technical data is thin, so it’s best for buyers who can get the current data sheet from a Super-Krete dealer.
| Type | Penetrating reactive densifier / sealer |
| Chemistry | Not named; reacts with alkali and free lime in cement to form an internal crystal-like shield |
| Finish | Penetrating; no film described |
| Coverage | About 300 sq. ft. per gallon (dealer listing) |
| Application | Spray only |
| VOC | Zero VOC |
| Dry/recoat | Not published in the sources we found; check the TDS |
| Best for | Basement walls and floors, retaining walls, stucco, block and slabs before coating |
| Not for | Sealed or contaminated surfaces it can’t penetrate; a substitute for moisture testing |
| New concrete | Labeled for new and existing concrete |
| Packaging | 1 gallon, 5 gallon, 55 gallon, 275-gallon tote |
Watch: Super-Krete Pene-Krete in 60 seconds
What It Is / How It Works
Pene-Krete is one of Super-Krete's long-running products and is still sold through decorative concrete and flooring distributors under the S1300 (or S-1300) part number. Super-Krete describes it as a non-hazardous penetrating densifier that reacts with alkali and free lime in cement to form an internal, crystal-like shield inside the pores.
Super-Krete doesn't name the active ingredient in the materials we found. The way it's described, a reactive treatment that builds inside the concrete rather than on top, puts it in the same general family as silicate densifiers and crystalline treatments. The company says it penetrates up to 8.5 inches, can raise the compressive strength of concrete by up to 23%, reduces permeability, moisture vapor and radon transmission, and can extend the life of coatings by "as much as 300%." Those are manufacturer claims, and we didn't find independent test data to back up the specific numbers.
Super-Krete also sells a Pene-Krete Additive for fresh concrete, which keeps cement hydrating longer and improves workability. That's a separate product from the S1300 surface treatment reviewed here.
Where It Works Best (and where it doesn't)
The product is pitched for any portland cement-based surface: new or existing slabs, industrial floors, foundations, parking structures, fire-damaged slabs, block, stucco, precast, plaster and gunite. Super-Krete's original launch notes singled out wet areas such as retaining walls, basement walls and floors, and stucco. Super-Krete also lists it as a step in its own decorative finish recipes.
It only works if it can get into the concrete. Super-Krete says surface prep must be "sufficient to allow Pene-Krete to penetrate," so sealed, painted, oily or very dense troweled surfaces need to be opened up first. Distributors also include an important warning: slabs poured without an effective vapor retarder can still pass enough moisture vapor to blister and fail a coating. The coating applicator should run ASTM F1869 (calcium chloride) or ASTM F2170 (relative humidity probe) tests before coating. In other words, don't treat Pene-Krete as a guaranteed fix for a damp slab.
Pros
- Zero VOC and labeled non-hazardous
- Works on a wide range of cement-based surfaces, new and old
- Penetrating treatment with no film to peel
- Doubles as a slab primer that readies surfaces for topcoats
- Marketed to reduce dusting, moisture vapor and freeze-thaw damage
- Sold in sizes from 1 gallon to totes
Cons
- Very little public technical data (dry times, coats, temperatures)
- Big performance claims without independent test data in the sources we found
- Spray application only
- Mostly sold through pro distributors; some sizes show as back-ordered
- Doesn't replace moisture testing before a coating goes down
- Active chemistry isn't named
How to Apply It
Super-Krete's full instructions are on its technical data sheet, which we couldn't access directly. The steps below cover what distributor listings state, plus standard prep for reactive penetrants. Follow the current TDS for dry times, coats and temperature limits.
- Get the current TDS from your Super-Krete dealer and confirm temperature limits and number of coats for your surface.
- Prepare the surface so the product can penetrate. Remove sealers, paint, curing compounds, oil and laitance. Water should darken the surface when sprinkled on it.
- If a coating will follow, run ASTM F1869 or F2170 moisture tests on the slab.
- Protect glass, metal and landscaping from overspray.
- Spray evenly at roughly 300 sq. ft. per gallon, adjusting for porosity. Don't let puddles sit.
- Allow the drying and reaction time on the label before applying any coating or overlay.
How It Compares
Euclid EUCOSIL is a sodium silicate densifier with a full data sheet: 150–600 sq. ft. per gallon, 4–6 hours to foot traffic and 5 g/L VOC or less. It's better documented and can be brushed or scrubbed in, but it's aimed at dustproofing and densifying floors rather than coating prep.
Kryton Krystol T1 is a cementitious crystalline slurry for serious below-grade waterproofing. It's harder to apply but comes with published hydrostatic and crack-sealing test data. If your basement wall actually leaks, it's the more proven option.
Silane/siloxane water repellents don't densify, but they're the better choice when your main goal is keeping rain and deicing salts out of exterior concrete. See our best penetrating concrete sealers for options.
FAQ
Is Pene-Krete waterproof?
Super-Krete markets it as reducing water and vapor passage and originally said it "waterproofs any portland cement-based substrate." But it also warns that slabs without a vapor retarder may still pass enough vapor to damage coatings. Treat it as a moisture-reducing treatment, not a membrane. For leaking walls, see our best waterproofing concrete sealers.
Can you put epoxy or paint over Pene-Krete?
Yes. Super-Krete sells it partly as a primer that readies surfaces for topcoats. Moisture-test the slab first and follow the coating maker's requirements.
Is S1300 Pene-Krete still sold?
Yes. Distributors list it under part numbers like 02-MRPK1300-1G in gallon, pail, drum and tote sizes, though some sizes show as back-ordered. Check current price and stock with a dealer.
Does it change the look of concrete?
It's a penetrating treatment with no film described, so it shouldn't add gloss. Test a small area first if appearance matters.
Verdict
Pene-Krete is a long-standing, zero-VOC penetrating treatment that fits well as a densifier and primer under coatings and overlays, especially inside the Super-Krete system. What holds it back is how little technical data is public and how far its marketing claims go beyond what we could verify. Get the current TDS, moisture-test your slab and it can be a useful prep step. Our rating: 3.5/5
How we reviewed this product: this is a research-based review built from the manufacturer's technical data sheet and current retail listings. We have not run our own hands-on tests of this product. Details were checked in October 2026; always follow the current label.