Nobody who owns a car want rust. Rust is carowner's nighmare, and it can eat away your car. Though rusting is a natural process that can't be avoided, it can be slowed down. If you regularlly maintain your car, it will be in good shape. Here is how you can treat rust.
1) Clean the rust spot with a moistened cloth with white spirits. Then scrape out the loose paint, and rub the rust area with sand paper.
2) Apply the primer after clearing of the dirt by using a fine paint brush.
3) Smooth a thin layer of cellulose stopper with knife.
4) Apply the repair paint.