I use the silicone impregnated Gun Socks. They breathe a little, but are quite good at repelling moisture.
In their advertising, I've seen photos of safes that went through a fire. They show that the guns inside the safe in the silicone impregnated socks survived the fire without rust damage.
We get a range of humidity her in NC. In the summers it gets pretty high. Several years ago, I had a blued Interarms "Star" start to develop pinpoint rust while inside it's gun rug. Since I've switched to the socks, I haven't had a problem.
Marc
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 Igitur si vis pacem, para bellum -
- Therefore if you want peace, prepare for war.
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