Rust-Oleum Plastic Roof Cement is ideal for fast repairs or rebuilding exterior roll roofing, polyester fabric, fiberglass and more. Fibered, asphalt based durable roof sealant provides help for quick installation of roof flashings at parapet walls, gravel stops, stacks, vents, monitors and similar projects with a smooth, reinforced coating. Dries to the touch in 2 hours, fully cured 24 hours. Mineral spirits cleanup. Exterior use only.