Description For Gutters And Flashings. Designed To Penetrate And Saturate Flat Built-Up And Composition Roofs. Provides A Tough, Durable, Weather-Resistant Film. Contains Non-Mineral Fibers. Can Be Used At Lower Temperatures. 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