Answer
Use the abrasive grit side against the work surface. The backing side should face your hand or block.
Why it happens
Sandpaper has an abrasive grit side and a backing side.
Recommended grit
Use the selected grit with the abrasive side touching the work surface.
Wet or dry
Wet or dry use.
Success check
The abrasive side contacts the surface and cuts evenly.
What to do
- Identify the abrasive side by texture and grit marking.
- Place the abrasive side on the surface.
- Use even pressure.
- Clean the surface before changing grits.
Avoid: Do not sand with the backing side.