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Problem

What grit for galvanized metal before painting?

Paint may not stick well to galvanized metal if the surface stays slick or contaminated.

metal paint primer dry sanding
Answer

For galvanized metal before painting, clean first, then scuff lightly with 220 or 320.

Why it happens
Galvanized metal needs cleaning and light scuffing; aggressive sanding can damage the coating.
Recommended grit
Use 220 or 320 for light scuff sanding before compatible primer.
Wet or dry
Dry.
Success check
The surface is clean, dull, and lightly scuffed before primer.

What to do

  1. Clean the galvanized metal first.
  2. Scuff lightly with 220 or 320.
  3. Remove dust and residue.
  4. Apply a primer compatible with galvanized metal.
Avoid: Do not grind through the galvanized coating with coarse grit.

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