Rust-Oleum 350 Fibered Black Roof Coating is an asphalt-based roof coating designed to protect against the harshest effects of the environment. Premium, cold applied coating system offers waterproofing, weatherproofing and easy maintenance of smooth asphalt built-up or modified bitumen roofing membranes. Extremely flexible, resists splitting and cracking. Low temperature application. High quality waterproofer renews older roofs and can be applied by brush, squeegee, roller or spray for superior durability. 24 hour fully cured. 3 year shelf life.