An undercoat for a vehicle body is either already applied from the manufacturer or can be applied by a professional auto body shop.


Automotive rust proofing and undercoating applied to new vehicles helps keep rain, snow and ice from coming into contact with the car’s frame, which is constructed from steel, iron, fiberglass and other metals. Applying a primer, wax coating and corrosive resistant treatment product to automobile frames protects them from rust corrosion.


Automotive rust proofing and undercoating professionals use gels, sealants and phosphate sprays on the auto body. Rubber is added to certain areas of the vehicle as a rainwater sealant. Manufacturers also typically add a primer undercoat of paint to make it rustproof.


Rubberized undercoating products are available in either can or aerosol. Rubberized undercoats are typically applied to wheel wells, trunk areas, undercarriages and floor pans, and some are not paintable. Alternative to rubber undercoating is bar and chain oil undercoating. Bar and chain oil undercoating helps kill rust, and the oil and wax leaves behind a sticky residue.