Answer
For RV gelcoat oxidation, wet sand 1000 or 1500, then 2000 and 3000 before polishing.
Why it happens
Oxidized gelcoat needs fine wet sanding only when cleaning and polishing are not enough.
Recommended grit
Use 1000 or 1500 for oxidation, then 2000 and 3000 before polishing.
Wet or dry
Wet.
Success check
The gelcoat has an even fine haze before polishing.
What to do
- Wash the RV gelcoat first.
- Use 1000 or 1500 only when oxidation needs sanding.
- Refine with 2000 and 3000.
- Polish and protect after sanding.
Avoid: Do not start with coarse grit on gelcoat oxidation.