What are the treatment methods for car paint that has damaged the primer?

[DelCamila]

There are several treatment methods for car paint that has damaged the primer: 1. Small scratches damaging the primer: For minor scratches, a touch-up pen can be used. The touch-up pen can handle small scratches. If the rust is not severe, use very fine sandpaper dipped in water to gently remove the rust spots, but avoid sanding randomly—sand in straight lines in the same direction. After completely cleaning, apply a layer of primer. 2. Large areas of exposed primer: This requires repainting. If considering insurance issues and choosing not to repair immediately, rust prevention treatment (toothpaste) should be done. Apply a layer of wax and repair as much as possible. In this case, you can choose coarse wax with large abrasive particles; if coarse wax is unavailable, liquid wax can also be used.