Description Thin Penetration Solution Of Selected Asphalt Base In Petroleum Solvent. Penetrates Pores And Seals Dusty Concrete And Masonry Surfaces To Provide A Firm Bond For Asphaltic Coatings. 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