Answer
For polycarbonate scratches, wet sand with 1000, then 1500, 2000, and 3000 before polishing.
Why it happens
Clear polycarbonate needs a fine wet sanding sequence and polish after sanding.
Recommended grit
Use 1000 for light scratches, then 1500, 2000, and 3000 before polishing.
Wet or dry
Wet.
Success check
The surface has an even fine haze with no deep scratch lines before polishing.
What to do
- Clean the polycarbonate first.
- Wet sand light scratches with 1000.
- Refine with 1500, 2000, and 3000.
- Polish after sanding to restore clarity.
Avoid: Do not use coarse grit on clear polycarbonate.