Answer
Between cured water-based finish coats, use 320 or 400 lightly, then remove dust before recoating.
Why it happens
Water-based finishes can raise wood fibers or trap small dust nibs after the first coat.
Recommended grit
Use 320 or 400 lightly between cured water-based finish coats.
Wet or dry
Dry.
Success check
The finish feels smooth and is ready for the next coat.
What to do
- Let the coat cure as directed.
- Sand lightly with 320 or 400.
- Focus on rough fibers or dust nibs.
- Remove dust before the next coat.
Avoid: Do not use heavy pressure between thin finish coats.