Answer
For metal gutters before painting, clean first, scuff with 220 or 320, then use 400.
Why it happens
Metal gutters need cleaning and scuff sanding before primer or paint.
Recommended grit
Use 220 or 320 for scuffing, then 400 for smoother visible areas.
Wet or dry
Dry.
Success check
The gutter is clean, dull, and ready for primer or paint.
What to do
- Wash and dry the gutters.
- Remove chalky oxidation or loose paint.
- Scuff with 220 or 320.
- Use 400 on smoother visible areas before primer.
Avoid: Do not paint over chalky oxidation or dirt.