Answer
Fine grit will not level rough defects efficiently. Go back to a grit that cuts, then step finer.
Why it happens
Fine grit refines scratches but removes material slowly, so it cannot level rough defects efficiently.
Recommended grit
Go back to a grit that still cuts the defect, then step finer.
Wet or dry
Dry or wet depending on surface and stage.
Success check
The defect begins to level before fine refinement starts.
What to do
- Stop using the fine grit.
- Identify the defect depth.
- Return to a coarser grit that removes it.
- Step finer gradually.
Avoid: Do not waste ultra-fine sheets on heavy removal.