Answer
Between shellac coats, use 320 or 400 very lightly after the coat is fully dry.
Why it happens
Dust, raised fibers, or uneven application can leave small imperfections after a coat dries.
Recommended grit
Use 320 or 400 very lightly between fully dry shellac coats.
Wet or dry
Dry.
Success check
The surface feels smooth and the next coat flows evenly.
What to do
- Let the shellac dry fully.
- Scuff lightly with 320 or 400.
- Remove dust carefully.
- Apply the next coat without heavy sanding.
Avoid: Do not sand through shellac with heavy pressure.