Will the rust on the car door expand?

[GideonRose]

Rust on the car door can expand. Many cases of door rust are caused by rainwater corrosion. After all, rain is unavoidable, and sometimes forgetting to clean it can lead to rust, affecting the car's appearance. If some damages are not addressed promptly, they will eventually rust over time, and the rusted area will grow larger, requiring timely treatment. Below are some methods to deal with door rust: 1. If the rust appears on the surface and the area is small: You can use water sandpaper to grind off the rust and then spray a layer of rust-proof paint. 2. If the rust has damaged the primer: After grinding off the rust, spray the primer first, followed by the topcoat. 3. If the door rust is more severe: If there is a large area of paint peeling, the rusted paint on the door must be completely scraped off, then filled and leveled with putty. After the putty hardens, repaint the door. 4. If the door is rusted through: Generally, it is not recommended to repair it, as the repair effect is limited, and rust may reappear after some time. It is more advisable to replace the door.