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UGL Drylok Gray Masonry Waterproofer. Gallon. The manageable way to solve water seepage problems. Reduces radon gas penetration by reducing vapor transfer. Formulated to waterproof above or below grade masonry walls, cinder and concrete blocks, stucco, brick, retaining walls, basement and foundations. Tintable, low odor, non-flammable, no pre-mixing or pre-wetting, etc.