How to Repair Automotive Rust
- 1). Grind down the rust with a sander until you reach bare metal. Use 80- to 100-grit sandpaper.
- 2). Apply an automotive primer to the sanded area. Use a brush, or spray on the primer. The primer gives the automobile a rust-proof coating that protects the car from corrosion.
- 3). Use touch-up paint if necessary. Apply the paint with a brush, or use spray paint.