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Problem

What grit to smooth welds?

Welds can leave high spots, sharp edges, and coarse grinding marks.

metal paint primer wet sanding
Answer

For smoothing welds, shape with 80 or 120, then blend with 180, 220, and 320.

Why it happens
Weld cleanup needs shaping first, then finer grits to blend the repair into surrounding metal.
Recommended grit
Use 80 or 120 for shaping, then 180, 220, and 320 for blending before paint.
Wet or dry
Dry for shaping; wet only for fine finishing stages.
Success check
The weld area is smooth, blended, and has an even scratch pattern.

What to do

  1. Remove sharp high spots first.
  2. Shape with 80 or 120.
  3. Blend with 180 and 220.
  4. Finish with 320 before primer or paint.
Avoid: Do not jump from rough weld cleanup directly to paint.

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