Water tite Clear Mold and Mildew Proof Waterproofing Paint forms an impermeable, smooth, non-pigmented barrier to water on bare masonry wall and floor surfaces. Intended for use on interior or exterior, vertical or horizontal, concrete block and cast-in-place concrete. Backed by a 10-year waterproof guarantee, and 5-year mold and mildew proof paint film guarantee, it can be used to stop moisture from entering or exiting a concrete surface.