Zinsser Drygard Waterproofing Paint is a low odor, water-based paint designed to form a waterproof barrier on interior and above or below grade exterior, concrete block (not lightweight block), and cast-in-place concrete. Drygard can stop water pressures up to 10 pounds per square inch from entering or exiting a concrete surface. It is a good option for waterproofing basements, cellars, or other areas that may become damp or wet. It is not recommended for use in swimming pools or in contact with potable water.