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Problem

What grit to sand primer on a 3D print?

Primer on a 3D print shows rough spots, scratches, or layer lines.

plastic paint primer wet sanding
Answer

For primer on a 3D print, use 400 or 600 lightly, then 800 for smoother paint prep.

Why it happens
Primer fills small imperfections but still needs fine sanding before the next coat or paint.
Recommended grit
Use 400 or 600 on primer, then 800 for finer paint prep.
Wet or dry
Dry or wet depending on primer instructions.
Success check
The primer is smooth, even, and ready for paint.

What to do

  1. Let primer cure as directed.
  2. Sand lightly with 400 or 600.
  3. Use 800 for smoother paint prep.
  4. Clean dust before the next coat.
Avoid: Do not sand uncured primer on plastic.

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