Answer
For a clear coat blend edge, wet sand lightly with 2000, then 3000 before polishing.
Why it happens
Blend edges need very fine wet sanding so the transition can be polished without deep scratches.
Recommended grit
Use 2000, then 3000 before polishing.
Wet or dry
Wet.
Success check
The transition is smooth with a uniform fine haze before polishing.
What to do
- Let the clear coat cure enough to sand.
- Wet sand the blend edge lightly with 2000.
- Refine with 3000.
- Polish to blend the transition.
Avoid: Do not use coarse grit on a clear coat blend edge.