How to Deal with Rust on the Car Roof?
2 Answers
Use ultra-fine water sandpaper dipped in water to gently sand away the rust spots, completely clean the area, and apply a layer of primer to ensure the rust does not spread or worsen. You can purchase a touch-up paint pen in advance. After the applied primer has dried, sand it smooth with water sandpaper, then use the touch-up paint pen for coloring. Keep a tube of ordinary toothpaste in the car. If you notice small new scratches, apply a little toothpaste. After rain or washing the car, the application can act as a barrier, which is effective in the short term. Periodic inspection and prevention are essential.
Last time, my friend noticed his old car's roof was bulging and only then discovered it was rusted. Actually, treating roof rust early prevents it from rotting through. First, thoroughly sand off the paint around the rust spots to expose the metal layer, being careful not to sand through the sheet metal. For small pits, apply two coats of epoxy rust-proof primer—brands like Dega offer longer-lasting rust protection. Once the primer dries, fill the dents with body filler, sand it smooth, and then spray on matching paint. Remember, the edges of the windshield seal are prime spots for moisture buildup, so inspect them closely. If rust has eaten through and created a hole, you’ll need to visit a repair shop to cut out the rotted metal and weld in a new panel—otherwise, leaks will worsen, and in winter, melted snow can seep in and freeze into icicles on the roof.
