Definitions for "Undercoating"
The application of a sound-deadening and/or rust-inhibiting chemical, wax or sealer to the underside of a vehicle. Don't confuse it with rustproofing (See Rustproofing) which includes coating the inside body panels and other rust-prone areas of the vehicl
The material sprayed on the underside of the automobile, under the hood, trunk lid, etc. which is designed to deaden sound and prevent the formation of rust.
A protective material applied to the undersides of new cars to prevent the formation of rust.