Answer
For bamboo before oil, use 180 then 220. Clean all dust before applying oil.
Why it happens
Bamboo is dense and can show sanding direction and uneven scratch patterns under oil.
Recommended grit
Use 180, then 220. Stop at 220 before oil for a clean, even surface.
Wet or dry
Dry.
Success check
The bamboo looks evenly dull and feels smooth before oil.
What to do
- Clean the bamboo surface.
- Sand evenly with 180 grit.
- Finish with 220 grit in the grain direction where possible.
- Remove dust before applying oil.
Avoid: Do not over-polish bamboo with ultra-fine grit before oil.