Answer
For edge banding before painting, use 220 lightly, then 320 for primer prep.
Why it happens
Banding needs light leveling and scuffing without sanding through the thin edge layer.
Recommended grit
Use 220 for leveling, then 320 for primer prep.
Wet or dry
Dry.
Success check
The edge is smooth and the seam is blended before primer.
What to do
- Check for glue ridges or raised seams.
- Level lightly with 220.
- Refine with 320 before primer.
- Remove dust from the edge before paint.
Avoid: Do not sand through thin edge banding.