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Problem

What grit for ABS plastic parts?

ABS plastic can scratch or smear if sanded with too much pressure.

plastic wet sanding dry sanding scratches
Answer

For ABS plastic parts, use 320 or 400, then refine with 600, 800, and 1000.

Why it happens
ABS needs moderate grit for shaping and finer wet sanding for smooth finish prep.
Recommended grit
Use 320 or 400 for shaping, then 600, 800, and 1000 for smoother prep.
Wet or dry
Wet for fine stages; dry can be used for early shaping.
Success check
The ABS surface is even with no melted or gouged areas.

What to do

  1. Clean the ABS part.
  2. Use 320 or 400 with light pressure.
  3. Refine with 600, 800, and 1000.
  4. Use wet sanding for finer finish prep.
Avoid: Do not press hard enough to heat or smear the plastic.

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