The way I see it you have two options Jeff, one is to exchange SWMBO or find a proper (read cheap and reliable) protector.
As the first option is very likely an untenable one and the more expensive choice, it should not be considered seriously (or even humourously in some households).
So we can definitely dismiss that one ;)
I would suggest boiled linseed oil, warmed to increase the flow characteristics, or thinned with clean unadulterated mineral turps. The mineral turps will evaporate off as the linseed cures.
Linseed oil application is a very old method of corrosion protection. It can also be a bugger to remove later ::)
My preferred personal choice would be applying softened beeswax. You will have to use caution when handling your cast but that is what we do anyway. The beeswax will also negate any possibility of finger print rust marks from the acid on your hands.
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P.S.
Another excellent rust preventer is lanolin. Use the raw stuff, heated in a double boiler, then apply by brush and wipe with a rag. The rag is a carrier and can be used to apply as it gets loaded.
I have used both lanalin, BLO and beeswax to protect my tooling and all metal that needs protection. They all work well but what needs to be considered here, is we are applying to food vessels.
I have tried searching for recommendations but have been unsuccesful, so thought I would go ahead and ask. I have several skillets I need to put into long-term storage for my kids. SWMBO insists they can't all stay in the kitchen, so what would be the best way to treat and store these? My storage building IS NOT temperature or climate controlled, in any way.
Thanks in advance.