BLACK FLASH Flashing Cement Compound is a superior compound used for sealing around flashings and chimneys, repairing leaks in roofs, gutters and old flashings. It is an all weather sealant made of only the highest quality, tough plastic asphalt oils with long fibers. Non-hardening BLACK FLASH stays pliable in any weather. Can be applied to damp surfaces never pulls away from the joint. Won't crack at any temperature. Available in a caulk cartridge or bulk. Can be applied with putty knife or trowel. Works well to seal and fill in holes, cracks and crevices to create a permentant seal It's excellent adhesion ensures that all entrapped air is eliminated. Tools can be easily cleaned with common petroleum solvents.