Answer
For wrought iron rust, use 80 or 120 to remove rust, then 180 or 220 before primer.
Why it happens
Wrought iron details can hold rust in grooves, and the surface needs coarse removal followed by finer prep.
Recommended grit
Use 80 or 120 for rust removal, then 180 or 220 before primer.
Wet or dry
Dry.
Success check
Loose rust is removed and the surface is ready for primer.
What to do
- Remove loose rust with 80 or 120.
- Fold the paper to reach grooves and details.
- Refine with 180 or 220.
- Clean thoroughly before primer.
Avoid: Do not leave rust powder in detailed grooves before painting.