Answer
For resin 3D prints before painting, use 320 or 400 for support marks, then 600 before primer.
Why it happens
Support marks need leveling first, then finer grits before primer and paint.
Recommended grit
Use 320 or 400 for support marks, then 600 before primer.
Wet or dry
Dry after the print is fully cured.
Success check
The print feels smooth and has no raised support marks before primer.
What to do
- Make sure the resin print is washed and fully cured.
- Level support marks with 320 or 400.
- Refine with 600.
- Clean dust before primer.
Avoid: Do not sand uncured resin.