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.