Answer
For a garage door before painting, clean first, scuff with 220, then use 320 on smooth visible panels.
Why it happens
Garage doors need cleaning, dulling of glossy paint, and light scratch refinement before repainting.
Recommended grit
Use 220 for scuff sanding and 320 for finer paint prep.
Wet or dry
Dry.
Success check
The door is clean, dull, and evenly scuffed before painting.
What to do
- Wash and dry the garage door.
- Sand glossy paint with 220.
- Use 320 on visible smooth panels.
- Remove dust before primer or paint.
Avoid: Do not paint over chalky, glossy, or dirty surfaces.