Answer
Reduce pressure, avoid sharp snags, and use backing support. Replace torn pieces before finish sanding.
Why it happens
Sharp edges, high pressure, repeated folding, or snagging can tear a sheet.
Recommended grit
Use the grit required for the task and reduce pressure or use backing support.
Wet or dry
Dry for normal prep; wet for fine wet-sanding stages.
Success check
The sheet moves smoothly without snagging or leaving torn-edge marks.
What to do
- Check for sharp corners or burrs.
- Use a sanding block for support.
- Fold the sheet cleanly instead of crumpling it.
- Replace torn pieces that can scratch the surface.
Avoid: Do not keep using torn edges on fine finish work.