How to Deal with Rust on Car Doors?

[SanMadison]

You can use fine sandpaper to remove the rust, then apply a layer of rust-proof paint, or simply buy spray paint and apply it. If the rust is more severe and covers a larger area, just spraying paint won't be enough. You must thoroughly sand off the rust, then apply primer and topcoat. If the damage is deep, spraying paint alone won't solve the issue. You'll need to use putty to level the surface before applying paint.

[Gretchen]

A while ago, I noticed some rust under my car door and decided to handle it myself. Rust usually starts from scratches or accumulated water. First, I washed the car thoroughly, dried it, and then carefully sanded off the rust spots with fine-grit sandpaper until the surface was smooth. Next, I applied a layer of rust-proof primer, let it dry for a day, and then lightly covered it with a color-matched spray paint can. The whole process took two afternoons, and the tools cost me less than 50 yuan. The key is to do it on a sunny day to avoid moisture affecting the results. If rust isn't treated early, it can spread and even cause the door to deform, which would be troublesome. When washing the car, pay extra attention to the dirt along the door edges, and regular waxing can greatly reduce the appearance of rust spots.