Answer
For end-grain cutting boards, sand dry with 120, 180, and 220. Use 320 only lightly after 220.
Why it happens
End grain exposes open wood fibers that need even sanding before oiling.
Recommended grit
Use 120, 180, then 220. Use 320 only for a smoother hand feel after 220.
Wet or dry
Dry.
Success check
The board feels smooth and accepts oil evenly.
What to do
- Flatten and clean the board surface.
- Sand with 120 to level roughness.
- Refine with 180 and 220.
- Use 320 lightly only for extra smoothness before oil.
Avoid: Do not leave dust packed in end grain before oiling.