Zinsser WaterTite LX Ultra 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 the interior and above or below-grade exterior, vertical or horizontal, concrete block (not lightweight block), and cast-in-place concrete. It stops moisture from entering basement or cellar walls and prevents water from exiting when applied to canals or holding basins. It is ideal for fountains, reflecting pools, planters, retaining walls, privacy fences, and more.