Answer
For acrylic, use light pressure. Start around 400 or 600, then wet sand through 800, 1000, 1500, 2000, and 3000.
Why it happens
Acrylic needs light pressure and fine grit progression because coarse scratches can be difficult to remove.
Recommended grit
Use 400 or 600 for shaping, then 800, 1000, 1500, 2000, and 3000 before polishing.
Wet or dry
Wet for fine stages.
Success check
The acrylic has an even fine haze before polishing.
What to do
- Clean the acrylic surface.
- Use light pressure and a flat backing where possible.
- Move through 400, 600, 800, 1000, 1500, 2000, and 3000.
- Polish after sanding if clarity is needed.
Avoid: Do not use heavy pressure that heats or gouges acrylic.