Answer
Use a sanding block or backing pad. Blend finger marks with even pressure before moving finer.
Why it happens
The paper was pressed directly by fingers instead of being supported evenly.
Recommended grit
Use the same grit to even the area, then continue finer.
Wet or dry
Dry for prep; wet for fine finishing stages.
Success check
Finger-shaped marks are blended into an even scratch pattern.
What to do
- Place the sheet on a sanding block or soft backing.
- Sand the affected area evenly.
- Reduce pressure.
- Clean and inspect before moving finer.
Avoid: Do not use fingertips as the main sanding pressure on flat areas.