Zinsser WaterTite LX Mold & Mildew Proof Waterproofing Paint is a modified acrylic copolymer concrete and masonry waterproofing paint and finish. It is designed to form an impermeable barrier to water on interior and exterior, vertical or horizontal, concrete block (not lightweight block), and cast-in-place concrete. It stops moisture from entering basement or cellar walls and stops water from exiting when applied to canals or holding basins. It is ideal for use on fountains, reflecting pools, planters, retaining walls, privacy fences, and more. It is an excellent block filler for use in wet areas where epoxy finishes are to be applied, such as car washes, restrooms, etc. It is not recommended for use in swimming pools or use in contact with potable water. WaterTite LX meets ASTM D7088 Resistance to Hydrostatic Pressure and ASTM D-6904 Resistance to Wind Driven Rain.