I have a small gun safe in the back room of the garage. It is back there because it is out of site of anyone that comes. It is rarely opened as it is the over flow safe. It has several that just have special meanings like my first shotgun, and some that were owned by family members, and a few that I used to shoot regularly but had bought some that replaced them.
Most of what I use when I shoot anymore are in the safe in my bedroom, I don't have room to put the other safe in the house. The back room is concrete block and concrete floor, with no windows and really no air movement. I did wall off a portion of the room and raise the floor and insulate it and the walls. No heat in it but the doors to it are open and the heat from the garage works its way back there, so it gets very humid in the summer. I have a heater in it. I opened it a month or so ago for some reason, and found a lot of mildew on most of the guns. I was out over the weekend and bought a big tube of Flitz and a can of WD40 and over the last 3 days have been working on cleaning them up.
Last night I raised the safe off the wooden floor so air could get under it as well as around it. I noticed that many had more mildew towards the bottom of them than the barrel when stood in there. Also I had one shotgun in a gun sock that seemed unaffected, I have order more gun socks, I put in a bigger dehumidifier rod last night also. Size of the safe is about 22D 28W 60H, and it is maybe 15 years old.
My thought is to run power into it and put and outlet inside to plug the rod into and find a small timer and maybe a computer type fan I could run a rheostat on to get the speed I want and have it set to come on every 4 to 6 hours and run for maybe 10 minutes to move the air in the safe more than just the way the rod does it, sorry I don't know what that type of movement is, hot air rises and pushes the cold down.
So does anyone have or have had similar issues or have ideas on what I am thinking of doing or other suggestions?