Perma-Crete® Vertical Concrete Stain VCS is an opaque water repellent designed primarily for spray application to exterior, above ground, pre-cast and tilt-up masonry substrates. It is alkali and efflorescence resistant and can be applied to a substrate with a pH of 7 to 13. Perma-Crete® VCS provides resistance against water, UV light, staining, is breathable, and is a quick drying product which allows for a second coat application, typically in fifteen minutes. Perma-Crete® VCS will not peel, crack or blister from a properly prepared masonry or previously painted substrate. Perma-Crete® VCS is ideal for use on the walls and support structures of commercial buildings, concrete highway barriers, and bridge abutments. Perma-Crete® VCS is not designed to waterproof concrete block or other porous substrates.