Answer
For vinyl shutters, clean first, scuff lightly with 320 or 400, then use 600.
Why it happens
Vinyl shutters need cleaning and very light scuffing before suitable paint.
Recommended grit
Use 320 or 400 lightly, then 600 for smoother visible prep.
Wet or dry
Dry.
Success check
The shutter is clean, dull, and lightly scuffed without damage.
What to do
- Wash and dry the shutters.
- Scuff lightly with 320 or 400.
- Use 600 on smooth visible areas.
- Remove dust before primer or paint.
Avoid: Do not gouge or flatten vinyl texture.