Answer
For PVC before painting, clean first, scuff with 320 or 400, then use 600 for smoother visible prep.
Why it happens
PVC is slick, so paint needs a clean and lightly scuffed surface to grip.
Recommended grit
Use 320 or 400 for scuffing PVC, then 600 for smoother visible prep.
Wet or dry
Dry.
Success check
The PVC is clean, dull, and evenly scuffed before paint.
What to do
- Clean the PVC pipe first.
- Scuff the surface with 320 or 400.
- Use 600 on visible smooth areas.
- Remove dust before primer or paint.
Avoid: Do not use coarse grit that gouges the PVC.