L&M Lion Hard is one of the best-known lithium silicate densifiers for commercial floors. L&M Construction Chemicals is now part of Laticrete, so you’ll find it sold today as “Laticrete L&M Lion Hard.”
| Type | Lithium silicate densifier, hardener and sealer |
| VOC | Low; non-flammable and odorless |
| Typical coverage | About 600–800 sq. ft. per gallon on hard-troweled concrete |
| Coats | One coat normally recommended |
| Sizes | 5 and 55 gallons |
| Warranty | 10-year dustproofing warranty (per the manufacturer) |
What It Is
Lion Hard penetrates bare concrete and reacts to permanently densify and dustproof the surface. It can go on at placement, after final troweling, or on existing cured concrete, and it’s commonly used during polishing to harden the floor between grinding steps.
Pros
- Long-lasting dustproofing for high-traffic floors
- UV stable, so it won’t yellow, flake or discolor
- No waxing needed; the floor develops a sheen with use and cleaning
- Meets NFSI safe-floor requirements
Cons
- Sold through professional distributors in 5-gallon and larger containers
- It’s a densifier, not a water or stain repellent
- Works best on bare concrete; existing sealers and curing compounds must be removed
Who Should Buy It
It’s ideal for warehouses, retail and polished floors. For homeowners who want hardening plus water repellency in one step, see best concrete densifiers and silicate vs. silane/siloxane sealers.
How we reviewed this product: this review is based on the manufacturer’s current technical data and product listings, along with our experience with this type of sealer. Product details were last checked in October 2026; always confirm against the current label before you buy.