Answer
For rough painted trim between coats, use 320. Use 400 for a finer final scuff.
Why it happens
Dust, raised grain, or thick brush marks can leave a rough surface that needs light scuff sanding.
Recommended grit
Use 320 for normal smoothing, or 400 for finer trim paint prep.
Wet or dry
Dry.
Success check
The trim feels smooth and evenly dull before the next coat.
What to do
- Let the coat dry fully.
- Scuff lightly with 320.
- Use 400 for finer final prep.
- Remove dust before recoating.
Avoid: Do not sand soft paint before it is ready.