L&M Seal Hard


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SEAL HARD is a proprietary, colorless, environmentally safe chemical solution that increases the wear surface strength of concrete floors subjected to pedestrian and vehicle traffic. SEAL HARD penetrates concrete surfaces to seal, dustproof, densify and harden them. SEAL HARD floors last longer, cost less to maintain, are safe to use, and are guaranteed to resist dusting for years after application.

Through a chemical-ion exchange process, SEAL HARD develops internal bonds that densify the concrete substrate into a hardened, chemically-cured, homogeneous concrete mass that dustproofs, resists abrasion, and reduces oil and water penetration. This chemical-ion densifying process begins immediately upon treatment and continues through the initial six months following application, at which time the treatment becomes complete and permanent.

With its odorless, VOC free formula, SEAL HARD is environmentally safe to use. SEAL HARD is also safe to own. The deeply penetrating chemical action leaves no film and will not alter the natural non-slip texture of the concrete floor. Treated floors conform to ADA and OSHA requirements.

SEAL HARD treated floors provide significant savings in maintenance costs over conventional acrylic, epoxy and urethane sealers. SEAL HARD will not yellow, discolor, chip, peel or show unsightly wear patterns with use. SEAL HARD treated floors resist tire marks. In fact, the more a SEAL HARD floor is used and as it matures, the better it looks and more durable it becomes.

Basic Use: SEAL HARDis recommended for use in high-performance areas subjected to forklift and tow motor traffic: warehouses, distribution centers, manufacturing plants, textile mills, bottling plants, coolers, and freezers, food processing plants, canning factories, breweries, bakeries, meat and poultry processing plants, service garages, grocery stores, discount retail stores, hub transfer facilities.

Other uses include concrete floors subjected to heavy pedestrian traffic, such as civic centers, sports arenas, stadiums, hospitals, airports, museums, schools, and grocery stores; parking decks, sewage treatment plants, dairies, fish processing plants, refineries, and water treatment plants.

Additional information

Weight 50 lbs

5 gallons, 55 gallons




Coverage Calculator




This calculator estimates the amount of densifier required (in gallons) for a given area.

FOR ESTIMATING PURPOSES ONLY. Variations in concrete quality, porosity, job site conditions, temperature and relative humidity will affect coverage rates. ALWAYS TEST representative areas to confirm suitability, accurate coverage rates and desired results.

Spec Sheets

Seal Hard TDS.pdf
Seal Hard SDS.pdf
Seal Hard Brochure.pdf
Seal Hard Concrete Densifier Section 03 36 60.pdf
Seal Hard Owners Manual.pdf