Plus 1 for Evaporust

[nanuk]

on the recommendations here, I bought a bottle

bought one of those snap lid containers like RunFiveRun (I think) talked about

put some rusty moulds in it and put it up on a shelf

gave it a swirl once a day, and after a week ( finally had time to get at them ) took them out and rinsed them.

OY... nice and clean.

now... how to keep the rust OFF??? I need to pick up some of those sheets of "Stuff" that keeps rust at bay.

Thanks for the recommend, guys!

[Big Rack]

I've not used this product but I don't see why it wouldn't work. At Woodcraft stores they sell tool box lining material that also incorporates VCI's I think I would wrap the mold in a tissue then a piece of this and a plastic bag.
I've used the same stuff without VCI to line my toolbox drawers with it works well but I don't know if I would trust bare steel against it for an extended time. Also if you purchase any kind of VCI wrap material make sure it's bagged as eventually the VCI's evaporate.

[Iron Mike Golf]

An overnight soak has been more than enough for anything I treated with EvapoRust. An hour is usually enough for a flea market bought mold.

[runfiverun]

rust is oxidization.
keep them away from oxygen,an oil coating,or sealed container with disilica packs usually turns the trick.