Causes And Solutions Of Sanding Scratches (sandpaper Marks)？

definition:
Edges are bulged and scratched.

Cause:
1. The sandpaper used to polish the metal surface or putty is too coarse, and the groove marks and scratches caused by it will show through the topcoat.
2. The intermediate paint is not dry or too soft before sanding.
3. Insufficient primer or insulation work before topcoat spraying.

Prevention method:
1. Sand the specific substrate with the type of sandpaper recommended by the manufacturer.
2. Allow the primer material to harden thoroughly before sanding.
3. Spray the intermediate paint and top coat with normal thickness.

Remedy:
Sand the affected area thoroughly and respray.