Answer
Use light pressure on cabinet door edges. Scuff with 220 and use 320 lightly between cured coats.
Why it happens
Edges have less surface area and sand through quickly when pressure is too heavy.
Recommended grit
Use 220 for edge scuffing and 320 for light between-coat sanding.
Wet or dry
Dry.
Success check
Edges are scuffed but not cut through to unwanted bare spots.
What to do
- Sand flat cabinet areas first.
- Use very light pressure on edges.
- Use 220 only enough to dull the gloss.
- Use 320 lightly between cured coats.
Avoid: Do not bear down on cabinet door edges.