Answer
Use a sanding block on flat areas. It spreads pressure evenly and helps prevent waves and finger marks.
Why it happens
Fingers apply pressure in narrow lines. A sanding block spreads pressure more evenly on flat surfaces.
Recommended grit
Use the same grit sequence, but wrap the sheet around a flat block for flat areas.
Wet or dry
Dry or wet depending on the sanding stage.
Success check
The surface looks flat and has no finger-pressure grooves.
What to do
- Use a sanding block on flat surfaces.
- Keep pressure light and even.
- Change direction slightly between grits to see progress.
- Use fingers only for curves and details.
Avoid: Do not press with fingertips on flat panels.