Latex base Drylok Extreme masonry water proofer is the next generation in waterproof coatings. Features flexible encapsulated polymers which squeeze into the masonry for the ultimate in waterproof protection. Specially formulated to resist mildew growth on the dry paint film with the incorporation of an environmentally friendly green biocide. Tested to ASTM D-7088 resistance to hydrostatic pressure at 15 psi and ASTM D- 6904 resistance to wind driven rain. Reduces radon gas penetration.