Answer
For cabinet paint dust nibs, use 600 lightly. Use 400 only for larger nibs, then refine with 600.
Why it happens
Dust can land in wet paint, and the raised nibs need light leveling after the coat cures.
Recommended grit
Use 600 for light dust nibs. Use 400 only when the nibs are more noticeable, then refine with 600.
Wet or dry
Dry.
Success check
The surface feels smooth without cutting through the paint coat.
What to do
- Let the paint coat cure enough to sand.
- Level nibs lightly with 600.
- Use 400 only for larger raised nibs.
- Remove dust before recoating.
Avoid: Do not sand fresh soft cabinet paint.