I have a large safe in a damp, okay wet, unfinished basement. Brick walls, cracked concrete floor poured in 1917 - get the picture? After many years the guns are fine and all I use is one 18" and one 24" GoldenRod. The door doesn't seal and the humidity to the best of my knowledge has never been below 50% in the safe. I do keep the guns oiled and some of the ones I don't use much get a light wipe down once or twice a year with RIG grease. In the winter it stays about 55* down there, but the safe stays 3* warmer.
As a control, I keep a couple of small chunks of unblued, unlubed gun steel on a shelf and they haven't rusted.
I tried dessicants once upon a time, a big box and a large tub, and they saturated in a few days. Pfui.
John
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