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Problem

What grit for plastic bumper scratches?

A plastic bumper has scratches that remain visible before primer or paint.

plastic paint primer wet sanding
Answer

For plastic bumper scratches, use 320 or 400, feather the area, then finish with 600 before primer.

Why it happens
Plastic bumper repair needs the scratch leveled, then refined so primer can cover the sanding marks.
Recommended grit
Use 320 or 400 for scratch prep, then 600 for finer primer prep.
Wet or dry
Dry for shaping; wet can be used at 600 for finer finishing.
Success check
The scratch is leveled and the surrounding area is evenly feathered.

What to do

  1. Clean the bumper area.
  2. Sand the scratch with 320 or 400.
  3. Feather the surrounding area lightly.
  4. Finish with 600 before primer.
Avoid: Do not use heavy pressure that heats or gouges the bumper plastic.

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