Answer
For outdoor metal light fixtures, scuff with 220 or 320, then refine with 400.
Why it happens
Metal fixtures often have gloss, oxidation, or old coating that needs cleaning and light sanding.
Recommended grit
Use 220 or 320 for scuffing, then 400 for smoother visible prep.
Wet or dry
Dry.
Success check
The fixture surface is clean, dull, and ready for coating.
What to do
- Remove the fixture or mask nearby areas safely.
- Clean oxidation and residue.
- Scuff with 220 or 320.
- Refine visible areas with 400 before primer or paint.
Avoid: Do not sand or paint connected electrical parts.