LastiSeal® is a unique, state-of-the-art, waterproofing sealer for bricks, concrete, mortar, stones, and porous building materials backed by a 15-Year Waterproofing Warranty. This waterborne, polyester-polymer and polyurethane sealer, penetrates up to 4 inches inside brick, mortar, grout, concrete and masonry. LastiSeal fills the pores internally, bonding the substrate and curing as a hard plastic inside. A sealed surfaces will shed water and unless too rough, bead for years to come! UNSURPASSED PROTECTION & SERVICE LIFE - Unlike paints or surface sealers, LastiSeal will not change the appearance or your brick, concrete, or masonry. LastiSeal does not form a surface film and will not leave a gloss finish or color on the surface. Once cured (24 hours), the seal is practically permanent! SAFE, INDOOR/OUTDOOR USE: Seal bricks walls and floors, indoor and outdoors, basement concrete, outdoor concrete, pavers, driveways, pool-decks, patios, stones, tiles, grout, koi-pond, porous stone and even wood! Non-toxic, non-flammable, and non-hazardous. No odor. Ultra-low VOCs. Not harmful to plants.PROTECTS AGAINST: Freeze-thaw damage, wind-driven rain, negative side water pressure, spalling, spills, mold, algae, humidity, and efflorescence.PREP: Remove old paint, adhesives, oil stains, and efflorescence. Let new concrete cure for at least 4 weeks. Mask glass and finished surfaces against over-spray.CONDITIONS: The surface and ambient air must be above 45 °F but not hot in direct sunlight during the application. Surface must be dry.APPLICATION: APPLICATION: Using a hand-pump garden sprayer and a roller, apply a continuous saturating film on the surface and back-roll any puddles. Ready for foot traffic in several hours and for vehicles in 3 days.COVERAGE: Brick - 800-1,000 sq. ft., Concrete - 1,000-1,200 sq. ft., Blocks - 500 sq. ft. *Porous materials may need a second application.