Zinsser® WaterTite® Professional Mold and Mildew-Proof Waterproofing Paint has a unique oil-base formula that combines a state-of-the-art waterproofing resin with Portland cement to create the ultimate waterproof coating that stops up to 34 lbs psi of water pressure. It also contains a mildewcide to prevent the growth of mold and mildew for 10 years after application, making it great for basements and other masonry surfaces where mold and mildew can be problematic.