Answer
For gelcoat, wet sand 800 or 1000, then 1500, 2000, and 3000 before polishing.
Why it happens
Gelcoat needs fine wet sanding steps before polishing. Starting too coarse can create deep scratches.
Recommended grit
Use 800 or 1000 for leveling, then 1500, 2000, and 3000 before polishing.
Wet or dry
Wet.
Success check
The gelcoat has an even fine haze before polish.
What to do
- Wash the gelcoat surface.
- Wet sand with 800 or 1000 for leveling.
- Refine with 1500, 2000, and 3000.
- Polish after sanding to restore gloss.
Avoid: Do not stop at 800 or 1000 grit before polishing.