Answer
For wrought iron, use 80 or 120 on heavy rust, then 180 or 220 before primer.
Why it happens
Textured metal needs rust removal and scuff sanding without leaving loose debris.
Recommended grit
Use 80 or 120 for heavy rust, then 180 or 220 before primer.
Wet or dry
Dry.
Success check
The iron is clean, dull, and ready for primer.
What to do
- Brush off loose rust and paint.
- Use 80 or 120 on heavy rust spots.
- Refine with 180 or 220.
- Clean dust before primer.
Avoid: Do not paint over rust trapped in pits.