Answer
Use lighter pressure, clean often, and replace loaded sheets. For prep, 120 to 220 is common.
Why it happens
Soft paint or coating residue is smearing under pressure.
Recommended grit
Use the grit needed for the stage, often 120 to 220 for removal or prep.
Wet or dry
Dry for removal; wet only for suitable fine finishing stages.
Success check
The paper cuts instead of smearing paint residue.
What to do
- Clean the painted surface.
- Use lighter pressure.
- Wipe the sheet often.
- Replace loaded sheets promptly.
Avoid: Do not keep sanding with a glazed or loaded sheet.