Answer
Use 150 or 180 after 120, then finish prep with 220.
Why it happens
120 grit may still be an early prep step and needs follow-up refinement.
Recommended grit
Use 150 or 180, then 220 for smoother prep.
Wet or dry
Dry.
Success check
The wood feels consistently smooth before finishing.
What to do
- Sand evenly with 150 or 180.
- Clean dust from the surface.
- Finish prep with 220 if needed.
- Check by touch and light.
Avoid: Do not jump from rough 120 grit directly to very fine grit.