Waterproof Crystal Clear Gallon : Water-based silicone coating. Designed to provide protection on a multitude of surfaces by coating the pores of the substrates with silicone. For use on wood, brick, concrete and masonry. Penetrates and fills the pores of the substrate with premium grade silicon sealer. Ideal for new or properly reconditioned decks, fences, siding, shingles, shakes and logs. Covers 100-250 sq. ft. per gallon. Rates will vary depending on porosity of the surface.