Oil Undercoating protects all known metals by creating a non-drying barrier that seals out moisture and air. With the Oil Undercoating barrier in place, existing rust will be stopped on contact, and new rust and corrosion cannot develop. Oil Undercoating penetrates to the base metal, remaining active and migrating to inaccessible areas. Oil Undercoating provides long term protection from the corrosive effects of salts, calcium chloride, moisture and other corrosives.