Desiccants for Dry Gunsafes

[Shark1007]

I have a small room in the back of garage. It is maybe 6x10 and I have one of those portable AC units ducted outside thru a 4" hole. It exhausts condensate with the air.

I additionally have Eva Dry dehumidifiers, one in each safe, the kind you heat in electric plug to recharge when damp and a freestanding EvaDry unit with a 16 ounce reservoir. Everything seems to work, but I do occasionally get a little mold stuff in the dead holster drawer. Guns look fine.

Any suggestions MMJ? I don't really have room for big bags of desiccant in the safes.