Undercoating & Corrosion ~ 62 Lancer GT

ACCCC recommends using a creeping, light oil type of undercoating. This type of rustproofing soaks into the rust and seals it well. The heavy asphalt-like undercoatings work better on new cars just off the dealer's lot. If you get a shop to do it for you, find out exactly what they promise to coat and then make sure that they do it.