Answer
Avoid sharp creases when folding the sheet. Cut the sheet to size or wrap it around a block with a rounded bend instead of folding it tightly back and forth.
Why it happens
Sharp folds weaken the paper backing and can split the sheet during sanding.
Recommended grit
The grit is not the main issue. Use the grit required for the job, but handle the sheet without hard creases.
Wet or dry
Use the sheet wet or dry as needed, but avoid folding wet sheets sharply because wet backing can tear more easily.
Success check
The sheet stays flat against the work area and does not split along the fold.
What to do
- Cut the sheet into the size needed for the task.
- Avoid making a sharp crease through the abrasive.
- Wrap the sheet around a sanding block for flat work.
- Use a gentle bend when sanding curves.
- Move to a fresh section of sheet before the fold weakens.
- Let wet sheets drain instead of twisting or crumpling them.
- Discard pieces that start tearing into the sanding area.
Avoid: Do not crease the sheet repeatedly in the same line. That fold can become a tear point.