Answer
Between cabinet primer coats, use 320. Use 400 before a finer topcoat.
Why it happens
Primer often raises fibers or leaves small dust nibs that need light scuff sanding before the next coat.
Recommended grit
Use 320 between primer coats. Use 400 before a finer topcoat.
Wet or dry
Dry.
Success check
The primer feels smooth and evenly dull before the next coat.
What to do
- Let primer dry fully.
- Scuff lightly with 320.
- Use 400 for finer final prep before paint.
- Remove all dust before the next coat.
Avoid: Do not sand through primer on cabinet edges.