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Check the seals around your safe door. If you don't hear a whooshing sound when closing the door, your factory seal is letting moisture in.
Most safes have a reactive seal that swells up and protects the contents, but does a poor job of keeping out air laden moisture.
I ran an extra strip of common adhesive backed foam around the inner flange, and it made an airtight seal that stopped all infiltration.
Those seals are designed to expand when heated like in a fire. Keeping the air out is dandy... just till you open the door and then that dang air just gets in there again! I'm sure the foam idea isn't horrible but it doesn't take the place of a goldenrod or desiccant if you decide you need to go to that extent.
I agree to some degree... just saying thats not what those seals are for. I certainly will not disagree that a better seal is probably more effective... except in the case when you might put something that is humid inside.. then you might run into problems with too good of a seal.