Rust-Oleum Professional under-coating is an easy-to-use, black rubberized protective coating. It provides corrosion protection from water, salt and other chemicals. It helps deaden sound and provides a barrier from rust on cars, trucks, trailers and other recreational vehicles. For use on bare or primed metal including underbody and wheel wells of cars, trucks, trailers and other recreational vehicles. Not for use on surfaces that will come in direct contact with heat or high-temperatures such as mufflers, exhaust components. Professional undercoating features an advanced spray system that allows you to spray at any-angle, even upside down for those hard to reach areas. A comfort spray tip with a wider finger pad reduces fatigue caused by continuous spraying.