Answer
For pressure-treated wood before stain, use 80 or 100 on rough spots, then 120 or 150.
Why it happens
Outdoor treated lumber needs dry surface prep without over-polishing the grain.
Recommended grit
Use 80 or 100 on rough areas, then 120 or 150 before stain.
Wet or dry
Dry.
Success check
The surface is dry, smoother, and ready to accept stain.
What to do
- Make sure the wood is dry enough for staining.
- Sand rough areas with 80 or 100.
- Refine with 120 or 150.
- Remove dust before applying stain.
Avoid: Do not stain wet pressure-treated wood.