United Gilsonite Laboratories 28613 1 Gallon Drylok Extreme Masonry Waterproofer, White (2 Pack) The next generation in waterproof coatings. This smooth waterproof paint is perfect for the most demanding conditions. Fully transferable 15 year warranty. Ideal for interior, exterior, above or below grade masonry walls, basement walls, retaining walls, foundations, landscape walls, cinder blocks, concrete blocks, bare concrete swimming pools, stucco and brick. Flexible Encapsulated Polymer used for the ultimate in waterproof protection. Specially formulated to resist mildew growth on the paint film. Stops 12 psi, thatâs greater than a wall of water 26 feet high! United Gilsonite Laboratories 28613 1 Gallon Drylok Extreme Masonry Waterproofer, White (2 Pack) Features: Masonry waterproofer Drylok Extreme series Smooth waterproof paint is the next generation in waterproof coatings Fully transferable 15 year warranty Ideal for interior, exterior, above or below grade masonry walls, basement walls, retaining walls, foundations, landscape walls, cinder blocks, concrete blocks, bare concrete swimming pools, stucco and brick Flexible encapsulated polymer used for the ultimate in waterproof protection Specially formulated to resist mildew growth Stops 12 psi, greater than a wall of water 26" high Latex base Ceramic fortified