Rust forms when metal is exposed to water and oxygen. A car is susceptible to rust due to its exposure to the weather elements. Rust spots on a car door are.
How to stop/seal rust at the bottom of my car door - inside at the seam near odourless fish oil. it comes in a spray can,from the auto shop.
Rust can turn any car or truck into dust in not time. the fender, a bubble in the paint at the bottom of a door, suddenly soaked floors after hitting.