Answer
Stop, clean the sheet, allow more cure time, then resume with light pressure.
Why it happens
The finish may be too soft for sanding or too much heat is being created.
Recommended grit
Use fine prep grits such as 320 to 600 after the finish is ready.
Wet or dry
Light dry sanding or wet sanding where the finish and stage allow.
Success check
The finish sands evenly instead of smearing.
What to do
- Stop and clean the sheet.
- Allow more cure time if the coating is soft.
- Resume with light pressure.
- Use fresh paper if loading continues.
Avoid: Do not grind soft finish with heavy pressure.