Affiliate disclosure: Some links on this page are affiliate links. As an Amazon Associate we earn from qualifying purchases, at no extra cost to you.
SealMaster Concrete Sealer is a water-based, 100% acrylic clear sealer from SealMaster, a company better known for asphalt sealcoating and pavement maintenance products. It is sold mainly in 5-gallon pails and drums through SealMaster locations, and it is aimed at contractors and homeowners sealing driveways, patios, walks and garage floors. The bottom line: it is a straightforward, low-VOC acrylic that can be used on fresh or existing concrete, but it is a basic, lower-solids film sealer that will need regular recoating and is harder to find in small sizes.
| Type | Film-forming clear sealer (also meets ASTM C309 as a curing compound) |
| Chemistry | Water-based 100% acrylic emulsion, 18% non-volatiles |
| Finish | Dries clear, non-yellowing (sheen level not stated) |
| Coverage | About 200 sq ft per gallon (200–300 depending on porosity) |
| Coats | One thin coat recommended; optional second coat after 24 hours |
| Dry/recoat | Tack-free in under 40 minutes at 77°F; recoat after 24 hours |
| Temperature | Surface and air at least 50°F during and for 24 hours after |
| VOC | Under 100 g/L |
| Best for | Driveways, patios, sidewalks, walls, garage and basement floors |
| Not for | Cold-weather work; anyone wanting a small can or a penetrating, no-film finish |
| New concrete | Can be applied once fresh concrete is firm enough to walk on with no surface water |
Watch: SealMaster Concrete Sealer in 60 seconds
What It Is / How It Works
SealMaster Concrete Sealer (spec sheet product code SMT-250) is still listed on SealMaster's website under the same name. It is a ready-to-use blend of acrylic emulsion resins, surfactants and water. You spray or roll it on in a thin coat, the water evaporates and the acrylic resin forms a clear film on top of the concrete. That film is what blocks water, salt and oil from soaking in.
Because it meets ASTM C309 Type I Class A, it can also serve as a curing compound on freshly placed concrete, holding moisture in the slab while it gains strength. SealMaster's spec sheet lists "excellent" resistance in spot tests to motor oil, water, 10% sodium hydroxide, 10% sodium chloride, 10% calcium chloride, trisodium phosphate and ammonia, and it says the film stays clear when wet instead of blushing white.
The spec sheet lists 18% non-volatiles. That puts it on the lighter side for an acrylic sealer, so expect a thin protective film rather than a thick, glossy wet look. Thin acrylic films wear away with traffic and UV, which is why acrylic sealers in general are recoated every few years. For more on how acrylics compare with other sealer types, see our Best Concrete Sealers for 2026 guide.
Where It Works Best (and where it doesn't)
SealMaster lists driveways, parking lots, patios, sidewalks, statuary, concrete walls, factory floors, garage floors and basement floors as suitable surfaces, both interior and exterior. It makes the most sense on large jobs where buying a 5-gallon pail is practical, on new concrete where you want one product to cure and seal, and for anyone who already buys from a SealMaster location for driveway work.
It is a poor fit for cool-season work, because both the air and the surface must stay at or above 50°F for 24 hours after application. A thin acrylic film is also not the best choice for a garage floor that sees hot tires and heavy use; acrylics in general can soften or lift under that kind of wear, and an epoxy or polyurea coating is the stronger option there. If you prefer a sealer that leaves concrete looking untouched and does not need stripping later, a penetrating silane/siloxane is a better match.
Pros
- Water-based and low VOC (under 100 g/L), with water cleanup
- Meets ASTM C309, so it can cure and seal new concrete in one step
- Dries tack-free quickly (under 40 minutes at 77°F)
- Non-yellowing, and resists blushing when wet
- Published spot resistance to oil, salt solutions and common cleaners
Cons
- Sold in 5-gallon pails and larger, mainly through SealMaster locations
- Lower solids (18%), so a thin film that will need recoating
- Needs 50°F or warmer for 24 hours after application
- Sheen level and expected service life are not published
- Film-forming, so it can wear in traffic lanes and may need stripping before switching products
- Must not freeze in storage
How to Apply It
- On existing concrete, clean off all dust, debris and stains. On fresh concrete, wait until it is firm enough to walk on and there is no surface water.
- Check the forecast. Surface and air temperatures must be at least 50°F during application and for the next 24 hours, and rain should not be imminent.
- Stir thoroughly. Do not dilute.
- Apply with a garden-type or power sprayer (recommended), or a roller, brush or lambswool applicator.
- Put down one thin, even coat at about 200 sq ft per gallon. Avoid puddles.
- If a second coat is needed, apply it at least 24 hours after the first.
- Clean tools and sprayers with water before the sealer dries.
How It Compares
Big-box water-based acrylics: products sold at Home Depot and Lowe's under brands such as BEHR and Seal-Krete come in gallon sizes and often offer a choice of low-lustre or wet-look finishes. They are easier to buy for a small patio. SealMaster's advantage is the C309 curing rating and bulk packaging for larger jobs.
Solvent-based acrylic cure-and-seals: higher-solids solvent acrylics, such as ChemMasters' Certi-Vex AC 1315 SuperSeal HG, build a glossier, tougher film and tolerate cooler application temperatures (down to 40°F), but they carry higher VOC, strong odor and flammability warnings.
Penetrating silane/siloxane sealers: these soak in, leave no film to wear off and do not change the look of the concrete. They do not add gloss, but for a driveway that sees road salt they usually require less upkeep. See our best driveway sealer picks.
FAQ
Can I use SealMaster Concrete Sealer on new concrete?
Yes. SealMaster says it can go on fresh concrete once it is firm enough to walk on and has no surface water, and it meets ASTM C309 Type I Class A as a curing compound.
Is SealMaster Concrete Sealer glossy?
SealMaster describes it only as drying clear and non-yellowing; it does not publish a sheen level. With 18% solids applied in a single thin coat, it is not marketed as a high-gloss wet-look product.
Can it be used on asphalt?
No. It is listed as a concrete product. For asphalt driveways, SealMaster sells separate pavement sealcoats.
How cold is too cold to apply it?
Below 50°F. Do not apply if the surface or air will drop below 50°F within 24 hours after application.
Verdict
SealMaster Concrete Sealer is an honest, no-frills water-based acrylic with a useful C309 curing rating, quick dry and low VOC. It is best for larger jobs and contractors who already buy from SealMaster. Lower solids, bulk-only packaging and an unpublished sheen and service life keep it from ranking higher for most homeowners. Check current price and availability on SealMaster's product page. Our rating: 3.4/5
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.
