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GoldenRods require external air circulation - either from a loose door like on my safe or holes along the bottom and in the top. If your safe really is airtight you can use dessicant.
Try the refrigerator gasket test - close and lock the door on a dollar bill or a business card and then see if you can slide it around and pull it out. If you can the safe door isn't airtight. It doesn't take much of a crack around a 5' x 3' (or whatever) door to provide circulation. A 16' crack 1/32" wide is what, the equivalent of a 6-square-inch hole. The GR goes across the floor of the safe; the cool air is pulled in at the bottom, rises as it's heated, and exits. Warm air holds less moisture and because the guns are warmer than the surrounding room moisture doesn't condense on them.
I don't have central air and the only heat in the basement is from the insulated pipes running along the ceiling connecting the little Burnham gas boiler to the radiators. And the electric hot water tank, but that's wrapped in 6 inches of pink insulation.
John
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