LastiSeal is a deep-penetrating brick, concrete and masonry sealer designed to seal, strengthen and protect porous building materials from within. Its water-based polyester/polyurethane formula penetrates deep below the surface, bonding within the pores of brick, mortar, concrete and porous masonry to create a durable barrier against water penetration.Unlike topical acrylic and film-forming masonry sealers, LastiSeal does not leave a coating on the surface that can peel or flake. The breathable, non-film sealer preserves the natural color, texture and appearance of brick and masonry with no gloss, sheen or color enhancement. LastiSeal provides up to 15 years of protection while helping strengthen and harden porous, deteriorating masonry.Ideal as a brick sealer, masonry sealer, concrete sealer and paver sealer for brick walls and floors, mortar, grout, concrete block, stucco, poured concrete, patios, driveways, pool decks, limestone, sandstone, flagstone and other porous stone and masonry surfaces. Suitable for interior and exterior applications.The ready-to-use, water-based, low-VOC formula is easy to apply and allows treated masonry to remain breathable. LastiSeal helps reduce water absorption, efflorescence, staining, spalling and damage associated with water penetration and freeze-thaw cycles.COVERAGE: One 5-gal. pail covers approximately 800-1,000 sq. ft. of brick or 1,000 sq. ft. of poured concrete. Actual coverage varies with surface type and porosity. Color: Clear/Matte.