Wipe with a light oil. Like G96!
Or Fluid Film.
No snake oil fix for this. Dehumidifier and hydrometer that's monitored. I have 36% in and around gunsafes and reloading room. Two high end(Daikin) mini-splits with the correct settings do it! The powder storage is dryer again BIG MF do not eat bags lol there and in the safes. RUST NEVER SLEEPS
Fluid film isn't exactly snake oil. Any oil will prevent rust quite effectively, most gun oils do this well. All you are doing is denying the conversion 2 critical conditions for the conversion to take place. Water and oxygen. You can certainly use dehumidifiers but if rusting steel is the only concern then an application of oil is a far less expensive option and every bit as effective. And for people in an apartment, a less expensive option may fit the bill a bit better. I keep an old can of Outers gun oil in the reloading room to oil my dies and bare steel equipment after cleaning to keep them rust free.
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these quest dehumidifiers are top of the line best of the best. About $3000 for this dual 155 model. But 1 or 2 guns maybe less can be worth that alone.
My basement gets a bit gross in summer time and i had issues with surface rust in the house we moved into 18 monghs ago. Hot rainy days would be 70-80% humid down there.
That quest dual 155 keeps the humidity down to 40% all summer long. It's a beast.
If you have major $ invested in firearms and have humidity issues i highly recommend. Your sh*t ain't going to rust with that thing in your space trust me.
I'm quite aware of that! I'd just rather tackle the CAUSE than fight the result. My Dad taught me that a long time ago. I don't think he was wrong. I use the mini-splits for my comfort. No rust is just a valuable side effect.Rusted steel is far from my only concern. I don't want moist air hovering around my powder or brass. I don't think Fluid film will cut it! I have lots of it on the bottom side of my truck!