Zinsser WaterTite General Purpose Waterproofing Paint is a low odor, water-based paint designed to form a waterproof barrier on interior or exterior, concrete block (not lightweight block) and cast-in-place concrete. WaterTite General Purpose Waterproofing Paint can be used to stop water pressures up to 10 PSI 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.