Let us talk about desiccants for a minute. A desiccant is a hygroscopic substance that induces or sustains a state of dryness (desiccation) in its local vicinity in a moderately well-sealed container. Simply said, it removes moisture from the air and traps it, keeping that moisture away from anything else in that container. This makes them fantastic for preventing rust on stored firearms. For your gunsafe or other firearms storage container, a desiccant could mean the difference in the opening of your safe being a joyful experience or a negative one.
Here at Cheaper than Dirt we offer excellent values on silica gel desiccants. For those with large safes or in very humid climates we offer HySkore Drying Silica Gel in a 1 Liter Can. This large can protects up to 50 cubic feet.
The great thing about the silica gel is it is infinitely reusable. Heat to 250° F for 3 hours then allow to cool and the moisture absorbing capacity is renewed. This stuff is cheap insurance for your babies.