Answer
For powder coated metal, clean first, scuff with 320 or 400, then use 600 for finer prep.
Why it happens
Powder coating is hard and smooth, so the surface must be cleaned and scuffed before repainting.
Recommended grit
Use 320 or 400 to scuff powder coat. Use 600 for finer visible topcoat prep.
Wet or dry
Dry.
Success check
The surface is clean, dull, and evenly scuffed.
What to do
- Clean grease and residue from the powder coat.
- Scuff evenly with 320 or 400.
- Use 600 for finer visible areas.
- Remove dust before primer or paint.
Avoid: Do not paint over glossy powder coat without scuffing.