1-component urethane sealant. White, Colonial White, or Black colors. This sealant does not contain solvents and will not dry out and crack. Used to seal around roof penetrations, lap joints, trims, fixtures, etc. Best product for older rigs. HD caulk gun highly recommended. Typically used on RV roofs and walls to bed windows, trims, fixtures, skylights. Matte finish, 300 ml cartridge.