Answer
For metal railings, remove rust with 80 or 120, refine with 180 and 220, then use 320 before primer.
Why it happens
Metal railings need rust removal, loose paint removal, and a clean scuffed surface before primer or paint.
Recommended grit
Use 80 or 120 for rust and loose paint, then 180, 220, and 320 for paint prep.
Wet or dry
Dry.
Success check
The railing is clean, stable, and evenly scuffed before primer.
What to do
- Remove loose rust or paint with 80 or 120.
- Refine with 180 and 220.
- Use 320 for smoother primer prep.
- Clean dust and residue before coating.
Avoid: Do not paint over active rust or loose old paint.