You live in Cali, MGamer....the humidity is so low that I never had to take extraordinary measures to keep stored firearms from rusting in SoCal or NorCal. Same with the states just east of the Sierra Nevadas. You know that "air rust" you get on staples holding together old documents? Takes over 40% humidity to usually get that.
Anywhere else, it seems steel tanks just turn into rust monuments unless you keep them painted.
v/r, N-A