Guaranteed to stop up to 34psi of water pressure - twice the strength of other waterproofers. Prevents the growth of mold and mildew on the paint film for up to 5 years. Smooth, non-gritty finish applies easily to wet or dry walls. Ultra low odor oil-base formula has even less odor than latex paint. Great for basements and other interior/exterior above and below grade masonry surfaces. Watertite contains a mildewcide that prevents the growth of mold and mildew on the paint film only.