Answer
For cast iron rust, use 120 or 180 for heavy rust, then 220 or 320 to refine.
Why it happens
Rust needs a grit that removes oxidation without gouging the metal surface.
Recommended grit
Use 120 or 180 for heavier rust, then 220 or 320 to refine the surface.
Wet or dry
Dry for rust removal; clean thoroughly after sanding.
Success check
Rust is removed and the surface is clean before seasoning or coating.
What to do
- Remove loose rust and debris.
- Sand heavier rust with 120 or 180.
- Refine with 220 or 320.
- Clean all sanding residue before seasoning or coating.
Avoid: Do not leave abrasive dust on cookware or food-contact surfaces.