Use BONDO easy finis h heavy duty rubberized undercoating to protect the undercoating of vehicles. It produces a textured finish which resists chipping abrasion exterior rusting and weathering. This product provides one-coat build-up with no dripping running or sagging. One coat seals wheel wells and under carriage. It can also be used to seal tree wounds posts roofs and gutters. When used on vehicles it will also provide sound deadening properties. This rubberized undercoating spray is asphalt based and is not paintable.