DRYLOK Floor and Wall Masonry Waterproofer is the first non-pigmented masonry water proofer specifically formulated for use on bare masonry floor and wall surfaces. It's perfect for waterproofing interior and exterior concrete floors, poured concrete walls, split-faced block, concrete and cinder block, stone, brick, stucco and pre-cast decorative items. Drylok clear masonry water proofer has been tested in accordance to requirements of ASTM D-7088 resistance to hydrostatic pressure at 4 per square inch and ASTM D-6904 resistance to wind driven rain of 98 miles per hour.