The process of applying rust-inhibiting chemicals, waxes or sealers to the underside and inside of the vehicle's body as well as any other rust-prone areas. Not to be confused with undercoating which treats only the underside of the vehicle. Commercial ru

The application of an aftermarket rust inhibitor, applied by someone other than the automobile manufacturer, such as the dealer or other vendor.

Rustproofing is the process whereby the rate at which objects made of iron and/or steel begin to rust is reduced, so that the places in which they are rusting can be spotted in time and repaired. The term is particularly used for the automobile industry.

Meant to hold off body erosion, rustproofing is a popular extra on new cars. A type of rustproofing called galvanizing is used by manufacturers and comes with a new car. You'll pay extra for after market rustproofing, and there is controversy about its worth.