Answer
For a cutting board, use 120 for knife marks, then 180 and 220 before applying food-safe oil or finish.
Why it happens
Knife marks and raised fibers need smoothing before applying food-safe oil or finish.
Recommended grit
Use 120 for knife marks, then 180 and 220 for smoothing.
Wet or dry
Dry.
Success check
The board feels smooth with no deep knife ridges before oiling.
What to do
- Clean and dry the board completely.
- Sand knife marks with 120 if needed.
- Refine with 180 and 220.
- Remove dust before applying food-safe oil or finish.
Avoid: Do not sand a wet cutting board.