Rust-Oleum 301823 Roofing Neoprene Rubber Flashing Waterproofing Cement 300 ML Cartridge (Black) Rust-Oleum Neoprene Rubber Flashing Cement is a 100% synthetic rubber based sealant for sealing and repairing all types of flashing, metal roofs and trailers, built-up roofing, modified bitumen, asphalt, Kynar, EPDM and TPO surfaces. It is ideal for caulking termination bars, metal flashing and fasteners. It has excellent adhesion to wet or dry surfaces. Rust-Oleum Neoprene Rubber Flashing Cement contains no asphalt and dries to a black finish. For exterior use only. For more information, visit the website of Truworth Homes (Official Indian Partner of Rust-Oleum).