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Problem

What grit for aluminum window frames before painting?

Paint can peel from aluminum window frames if oxidation or gloss remains.

metal paint primer dry sanding
Answer

For aluminum window frames, clean first, scuff with 220 or 320, then refine with 400.

Why it happens
Aluminum frames need cleaning, oxidation removal, and light scuffing before primer.
Recommended grit
Use 220 or 320 for scuffing, then 400 for smoother visible prep.
Wet or dry
Dry.
Success check
The frame is clean, dull, and ready for primer.

What to do

  1. Clean the aluminum frame.
  2. Remove oxidation or loose coating.
  3. Scuff with 220 or 320.
  4. Refine with 400 before primer or paint.
Avoid: Do not paint over oxidation dust or silicone residue.

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