Zinsser Watertite LX Mold and Mildew-Proof Waterproofing Paint forms an impermeable barrier to water on interior, exterior, vertical, and horizontal concrete or masonry surfaces. Applied by brush or roller, the low-odor, latex-based paint leaves surfaces with a smooth, bright white, non-gritty finish. It endures up to 20 psi of water pressure, and contains a mildewcide to prevent the growth of mold and mildew on paint film. Rust-Oleum Corp. www.rustoleum.com