1. The scratch of the primer is damaged, which must be painted.
2. No scratches on the primer. This damage can generally be treated by polishing.
Tiny hair scratches:
When driving at high speed, even the dust in the air may cause tiny hair scratches on the surface of car paint. Facing the light, you can observe the thin lines on the car paint, but generally you can't touch them with your hands. Such tiny scratches can be easily removed with wax and fine cutting abrasives, such as mirror polishing wax. Because the abrasive in it is fine to nanometer level, it will not damage the original protective layer of car paint.
Slight scratches:
Sometimes naughty children pass by, and they will use the key to lightly cross the car body, leaving obvious scars on the car paint, but if you touch it carefully, you will feel that the scars are very shallow and only slightly sunken. In fact, this only hurts the transparent layer on the surface of the car paint. Using fine grinding wax, you can repair such a slight scratch by yourself. The principle is to rearrange the molecules of automobile surface paint and move the surface paint on the side to repair the wound.
Moderate scratches:
If you can clearly observe the scratches and touch the paint layer, the best way is to drive the car to the garage for professionals to deal with, otherwise you will only lose more scratches.