What are the methods for treating rust on a sedan?

[JudahLynn]

Methods for treating rust on a sedan are: 1. Remove the paint from the rusted area using a wire brush or sandpaper, and decide whether to replace the entire panel or repair the damaged part based on the extent of the damage; 2. For severe damage, apply zinc sand to the hole and then spread filler around the sand, fill with filler, and repaint; 3. For minor damage, use thin aluminum sheet to patch, press it firmly onto the panel, then fill with filler and repaint. The reasons for car body rust include: 1. Uneven roads causing body vibration; 2. Engine operation-induced vibration leading to welded connections coming apart or cracking; 3. Sun exposure and extreme cold causing paint surface cracking; 4. Thin steel sheets being eroded by moisture, damaging the protective layers on both inner and outer surfaces, leading to gradual body corrosion.