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Problem

What grit for cast iron rust?

Cast iron has rust spots or rough oxidation.

metal dry sanding polishing prep clogging
Answer

For cast iron rust, use 80 or 120 first, then 180 or 220 for cleanup.

Why it happens
Rust removal needs a grit that cuts oxidation without over-polishing the surface too early.
Recommended grit
Use 80 or 120 for rust, then 180 or 220 for smoother cleanup.
Wet or dry
Dry.
Success check
The rust spots are reduced and the surface feels more even.

What to do

  1. Remove loose rust first.
  2. Sand rust spots with 80 or 120.
  3. Refine with 180 or 220.
  4. Clean the surface thoroughly after sanding.
Avoid: Do not use ultra-fine grit first on active rust.

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