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Problem

What grit for aluminum window frames before painting?

Paint can peel from aluminum window frames if the surface is glossy or oxidized.

metal paint primer wet sanding
Answer

For aluminum window frames, clean first, scuff with 320 or 400, then refine with 600 before primer.

Why it happens
Aluminum needs cleaning, oxidation removal, and a fine scuff pattern before primer.
Recommended grit
Use 320 or 400 for oxidation and scuffing, then 600 for smoother primer prep.
Wet or dry
Dry for prep; wet can be used at 600 for finer finishing.
Success check
The frame is clean, dull, and evenly scuffed before primer.

What to do

  1. Clean the window frame first.
  2. Sand oxidation or gloss with 320 or 400.
  3. Refine with 600 for smoother prep.
  4. Remove dust before primer.
Avoid: Do not paint over chalky oxidation or loose residue.

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