Zinsser WaterTite LX Ultra Mold & Mildew-Proof Waterproofing Paint is a multi-purpose, latex-based, concrete and masonry, waterproofing paint and finish. It is designed to waterproof interior and exterior concrete, stucco, cement, cinder block and other masonry surfaces. WaterTite LX is an excellent block filler for use in car washes and garages and is ideal for use on basement and cellar walls, cast-in-place concrete, fountains, reflecting pools, planters, canals, retaining walls, privacy fences and more.