Answer
For a metal door before painting, scuff with 220 or 320. Use 400 for smoother visible finish prep.
Why it happens
Metal doors need a clean, dull surface and scratches fine enough for primer or paint.
Recommended grit
Use 220 or 320 for scuff prep. Use 400 for finer finish prep.
Wet or dry
Dry.
Success check
The metal door is clean, dull, and evenly sanded.
What to do
- Clean the metal door first.
- Scuff glossy paint with 220 or 320.
- Use 400 for smoother visible areas.
- Remove dust before primer or paint.
Avoid: Do not use coarse grit as the final step before paint.