How to Deal with Rust Bubbles on Car Doors?

[DelMaria]

Use a grinding wheel to sand the areas with rust bubbles on the car paint. After sanding the paint smooth, repeatedly wipe the sanded area with a wet towel to keep it clean and prevent dust. Apply putty paste and let it sit for a while. Once the putty paste hardens, sand it again with sandpaper. After the primer dries, spray the prepared topcoat on it. Once the paint dries, the car will look as good as new.

[ORyan]

Last time my own car had this issue, door bubble rust mainly stems from moisture accumulation and paint damage. If not addressed promptly, the rust can spread, affecting the door's structural strength. The first step is cleaning: pick a sunny day, use water and a cloth to wipe the rusted area clean, then sand off the bubbles and rust spots with sandpaper to expose the shiny metal. Next, apply a rust-proof primer, wait for it to dry, and then spray on some color-matched topcoat. The whole process might take about an hour, and the material cost is low—you can buy a rust-proof kit online for just a few dozen yuan. I often recommend friends to adopt a regular car-washing habit, especially removing water accumulation in door seams after rain, as this prevents problems before they arise. Remember, don’t ignore small issues—they can turn into major repairs.

[NovaAnn]

As a DIY enthusiast, I really enjoy tackling these small jobs. Bubbling and rust are mostly caused by poor paint quality or environmental corrosion. I'll first prepare the tools: a wire brush, rust remover, and touch-up spray paint. After cleaning the door edge, I'll directly brush off the rust flakes and spray rust remover to dissolve any remaining rust particles. Once dry, I'll evenly apply primer to prevent new rust. Finally, I'll spray the topcoat for coverage to maintain color consistency. The whole process takes about an afternoon, is cost-effective, and eco-friendly. I recommend taking this opportunity to check the door seals to prevent rainwater from seeping in again. This kind of maintenance not only saves money but also extends the door's lifespan.

[LaMelanie]

Door bubble rust needs quick treatment. First, clean the affected area with a damp cloth, then sand it down to remove bubbles and rust. Apply professional rust-proof paint to protect the metal, and finally touch up with matching original color paint. The key is to ensure a dry environment during the process to avoid secondary oxidation. If left unresolved, rust may corrode the door's internal structure, compromising driving safety. I always recommend regular maintenance to minimize exposure to rain.

[Parra]

My old car had the same issue before, it was really annoying. Door bubble rust is mainly caused by paint aging or rainwater accumulation. A simple solution is to apply rust remover paste to the rusty area, wipe it clean with a soft cloth, and then spray some touch-up paint to cover it and prevent further corrosion. The most cost-effective method is to buy a bottle of rust remover and spend a few minutes fixing it. In the long run, make sure to dry the door seams promptly after washing the car, especially after snow in winter. This can effectively prevent rust from spreading, save on repair costs, and maintain the car's appearance.