BEHR PREMIUM® Concrete & Masonry Protector & Waterproofer 980 is a premium, interior/exterior,waterproofing formula that uses the latest water-based, silicone technology designed to penetrate surfaces up to 1/2". This silane/siloxane waterproofer creates a barrier inside the surface that keeps water out, but allows trapped water vapors to escape; reducing corrosion, spalling, efflorescence and freeze-thaw damage. It reduces staining due to mold and mildew, and ensures greater durability of the surface. The protection is not worn away with normal use. It protects long after the water beading is gone.