Answer
Use 2000 or 3000 before polishing, after earlier scratches have been refined.
Why it happens
Polishing is easier after sanding scratches are refined to very fine grits.
Recommended grit
Use 2000 or 3000 before polishing where the surface and finish allow.
Wet or dry
Wet.
Success check
The surface has a uniform very fine haze before polishing.
What to do
- Refine the surface through the previous grits.
- Use 2000 for fine refinement.
- Use 3000 for an even finer pre-polish surface.
- Rinse and inspect before polishing.
Avoid: Do not polish over deep scratches left by coarse grits.