:wave Hello Sara.
we were at the World Ag Expo in Tulare, ca last febuary and ran across a vendor selling Rust Doctor (www.therustdoctor.com
we bought a couple of gallons (we have a lot of rusty metal for welding projects, etc.) about $140.00. they sell it in smaller containers.
it turns rust into magnetite (another metal) so that it can be painted or whatever.
hope this helps.