Answer
Use lighter pressure and finer grit near edges. Inspect often because edges sand through faster.
Why it happens
Edges have less material and receive more pressure during sanding.
Recommended grit
Use finer grit and lighter pressure near edges.
Wet or dry
Dry for prep; wet for fine finishing stages.
Success check
Edges remain intact while the surface is evenly prepared.
What to do
- Reduce pressure near edges.
- Use finer grit on vulnerable areas.
- Sand flat areas separately from edges.
- Inspect frequently.
Avoid: Do not use the same pressure on edges as on flat areas.