I use a product called DampRid to keep the safe "dry". Near the ocean we have a lot of moist air and it seems to help keep the moisture off the guns. I also put canister of moistureremover on the floor of the safe, however, it is a plastic container and tends to spill when I remove the container. (it's messy) The DampRid is in its own contained package, no mess no fuss.
jas

Currently own two Morgan cars. Starting on Black Powder hunting to advoid the mob of riflemen.