Answer
For aluminum shutters, clean first, scuff with 220 or 320, then refine with 400.
Why it happens
Aluminum shutters need cleaning, oxidation removal, and light scuffing before coating.
Recommended grit
Use 220 or 320 for scuffing, then 400 for smoother visible prep.
Wet or dry
Dry.
Success check
The shutters are clean, dull, and evenly scuffed.
What to do
- Clean the shutters first.
- Remove chalky oxidation.
- Scuff with 220 or 320.
- Refine with 400 before primer or paint.
Avoid: Do not paint over oxidation dust.