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Problem

What grit for model kit seam lines?

Plastic model seam lines can remain visible after assembly.

plastic primer wet sanding dry sanding
Answer

For model seams, use 400 or 600, then refine with 800, 1000, and 1500 before primer.

Why it happens
Seam lines need controlled sanding that removes the ridge without damaging nearby detail.
Recommended grit
Use 400 or 600 for seam removal, then 800, 1000, and 1500 for finer prep.
Wet or dry
Dry for shaping; wet for fine finishing where safe for the model.
Success check
The seam line is smooth and no longer visible before primer.

What to do

  1. Let glue or filler cure fully.
  2. Sand the seam with 400 or 600.
  3. Refine with 800, 1000, and 1500.
  4. Clean dust before primer.
Avoid: Do not use coarse grit near small molded details.

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