How to Deal with Rust Spots on a Car?
3 Answers
Use a grinder to sand the rusted area, thoroughly removing all traces of rust. Spray some expanding foam, then trim off the excess foam. Wipe the area clean and apply a layer of rust inhibitor. Once the adhesive is dry, use a grinder to smooth the edges, then apply body filler and sand it with sandpaper.
It's really annoying to see rust spots on the car! A while ago, a few small yellow spots appeared on the edge of my car's hood, so I slowly sanded off the rust with 800-grit sandpaper and cleaned it with alcohol. Then, I used a touch-up pen about the size of a nail polish bottle to dab on the paint—make sure to choose the right color. Remember to apply thin layers, with half-hour intervals between each layer, and finally polish it. Don’t always park under trees; tree sap and bird droppings corrode the paint really fast. When washing the car, pay extra attention to areas like the wheel arches where rust tends to hide. Rust spots on a car are like broken skin—if not treated promptly, they can spread and worsen, so take action immediately when you spot an issue.
Rust on car paint can range from minor to serious, and I've dealt with quite a few cases. Surface rust spots can be removed with polishing wax, but if the rust penetrates deeper, you'll need to sand it down to the primer, otherwise it's just wasted effort. At repair shops, they typically remove the rust first, then apply epoxy primer, and finish with topcoat paint—the whole process costs around 200 yuan. DIY touch-up kits are budget-friendly but often result in noticeable color mismatch, making them more suitable for older cars. After rainy days, remember to wipe dry any water accumulation around the door edges, as moisture is a major contributor to rust. Brake dust sticking to the paint can also trigger rust spots, so it's essential to perform a full-car iron particle removal every quarter.
