Do you have any steel stuff out there already? How does it look?
I'm close to you (but maybe far enough to make a difference?) and it hasn't been a big problem for me. My cast iron drill press table gets a little surface rust but can be cleaned with steel wool and would be immune if I used any kind of protectant. My space isn't airtight at all but good enough to use a dehumidifier without running constantly.
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