What to Do When Rust Spots Appear on the Car Roof?
2 Answers
If the rust is not severe, you can first use very fine water sandpaper dipped in water to gently sand off the rust spots, completely clean the area, and then apply a layer of primer. You can purchase a touch-up paint pen in advance. After the applied primer has dried, sand it smooth with water sandpaper, and then use the touch-up paint pen for color treatment. Keep a tube of ordinary toothpaste in the car. If you notice small new scratches, apply a little toothpaste. Reapply after rain or car washing.
I've personally experienced the issue of roof rust. Last month while washing my car, I noticed two pinhead-sized rust spots on the roof. I didn't pay much attention at first, but within two weeks they had expanded to the size of coins. I immediately purchased a rust removal kit to address it: First, I carefully sanded the rusted areas with 800-grit sandpaper until the bare metal was exposed, making sure no rust remained. Then I applied a metal converter and let it react for 20 minutes—this step is crucial as it prevents further internal corrosion. After that, I applied two coats of epoxy primer and finally sprayed on the matching topcoat. However, color mismatch is inevitable with touch-ups, especially noticeable on my white car that's often parked outdoors in direct sunlight. Now I inspect the roof and drainage channels monthly, and if I find any scratches, I touch them up immediately. I also keep a rust remover pen in the car for emergencies. My advice: if rust spots exceed the size of a fingernail, seek professional panel beating immediately—otherwise, water leakage could become a serious issue.
