Answer
For epoxy resin, wet sand 600, 800, 1000, 1500, 2000, and 3000, then polish.
Why it happens
Resin needs a gradual wet sanding sequence before polish can restore clarity or gloss.
Recommended grit
Use 600, 800, 1000, 1500, 2000, then 3000 before polishing.
Wet or dry
Wet.
Success check
The resin has a uniform fine haze with no visible deep lines before polishing.
What to do
- Make sure the resin is fully cured.
- Wet sand with 600 or 800 to level defects.
- Refine through 1000, 1500, 2000, and 3000.
- Polish after the final sanding step.
Avoid: Do not polish over deep 600-grit scratches.