Answer
For pressure-treated wood, let it dry, then use 80 or 120 for rough fibers and 180 for smoother prep.
Why it happens
Treated lumber often has raised fibers and needs dry sanding after it is clean and dry.
Recommended grit
Use 80 or 120 for rough boards, then 180 for smoother prep.
Wet or dry
Dry.
Success check
The board feels smoother and is clean before finish.
What to do
- Make sure the wood is dry before sanding.
- Use 80 or 120 to remove rough fibers.
- Refine with 180 for a smoother feel.
- Clean dust before stain or sealer.
Avoid: Do not sand treated wood while it is damp.