Answer
For wood turning, use 120 or 150 only for tool marks, then 180, 220, 320, and 400.
Why it happens
Lathe sanding can leave ring scratches if grits are skipped or sanding pressure is uneven.
Recommended grit
Use 120 or 150 for shaping marks, then 180, 220, 320, and 400.
Wet or dry
Dry.
Success check
The turned surface has no visible ring scratches before finish.
What to do
- Start with 120 or 150 only if tool marks remain.
- Progress through 180, 220, 320, and 400.
- Clean dust between grits.
- Inspect under side light before applying finish.
Avoid: Do not skip from 150 directly to 400 on turned wood.