Corrosions protection agent that forms a toughened, sealed, protective film when dry. The bituminous coating material has good anti-droning action and high abrasion resistance. High amount of solids content. Cannot be painted over. Underseal black is suitable for the coating of unpainted and painted surfaces on vehicle underbodies and wheelhouses and repairing or supplementing existing coatings. Surfaces which have to be treated with underseal black must be thoroughly cleaned beforehand. Rust must be removed. The surfaces must be dry and free of wax, dirt and grease and extensively free of dust. After use, the can must be inverted and sprayed until the valve is clear of the product, with only propellant escaping.