Answer
For bumper scuffs, use 320 for rough damage, then 400 and 600 before primer or paint.
Why it happens
Bumper plastic needs controlled sanding so the repair blends without deep scratches.
Recommended grit
Use 320 for rough scuffs, then 400 and 600 before primer or paint.
Wet or dry
Dry for shaping; wet can be used at 600 for finer finishing.
Success check
The scuff is blended and the surface is ready for primer or paint.
What to do
- Clean the bumper scuff area.
- Use 320 on rough scuffed plastic.
- Blend with 400.
- Finish prep with 600 before primer or paint.
Avoid: Do not dig a low spot into flexible bumper plastic.