Description Used On Edging And Flashings, Weathered Composition Roofing, Concrete, And Masonry Surfaces Prior To The Use Of Solvent Based Asphalt Coatings Or Adhesives. Covers 33 Sq. Ft. Per Can Depending On Porosity Of Surface. WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer, birth defects or reproductive harm and Butyl Benzyl phthalate (BBP) which is known to the State of California to cause birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov