Answer
For particle board, sand dry and lightly with 180 or 220, then use 320 after primer.
Why it happens
Particle board is softer and more fragile than solid wood, so aggressive sanding can damage the surface.
Recommended grit
Use 180 or 220 for light prep, then 320 after primer.
Wet or dry
Dry.
Success check
The surface is smooth, sealed, and ready for paint.
What to do
- Clean the surface gently.
- Sand lightly with 180 or 220.
- Prime or seal exposed edges.
- Scuff primer with 320 before paint.
Avoid: Do not wet sand raw particle board.