Answer
For veneer edges, use 220 or 320 with very light pressure. Do not use coarse grit.
Why it happens
Veneer is thin and fragile. Coarse grit or sanding across an unsupported edge can break it.
Recommended grit
Use 220 or 320 with very light pressure. Avoid coarse grit on thin veneer edges.
Wet or dry
Dry.
Success check
The veneer edge is smooth without chips, lifting, or sand-through.
What to do
- Support the veneer edge where possible.
- Sand with 220 using light pressure.
- Use 320 for final smoothing.
- Stop as soon as the edge feels smooth.
Avoid: Do not use 80, 120, or heavy pressure on veneer edges.