The problem with inexpensive document safes is that the insulation is down right wet. This can cause humidity in excess of 80% within the safe. If you look at the Sentry safes, you will notice the interior of the "safe" is plastic, while the outside skin is aluminum or stainless steel (depending on model). This is because the older Sentry safes that used steel would rust out.
If you want to store your guns in a small safe you should look for something of all steel construction, or a safe that uses a dry insulation.
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