How to prevent surface rust?

"Dirte"All my guns get wiped down with oil every time I handle them.
Same here. All my gun gets wiped down with Kroil after being used. No exceptions. I had a CZ barrel pit a few summers ago due to my negligence. Hoppes #9 is my all time favorite because I like the smell but I found Kriol does a better job of removing moisture/rust and protecting the metal. Kroil also does a great job of removing lead and protecting the inside of the barrel.

Here is an independent test of 46 rust inhibitors.

Comprehensive Corrosion Test: 46 Products Compared[/QUOTE]http://www.dayattherange.com/?page_id=3667&embed=true
 
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Some of the foam and pluck foam in quality hard cases have a corrosion inhibitor in the foam. I think they make some kind of tablet or something along those lines to put in the case as well to absorb humidity. A quality dehumidifier has a drain like an air conditioner, it just has to be run outside or to a drain. Never requires emptying. I have to buy one soon for the basement as it gets damp really bad and starts to stink.
 
You'se desiccant packets in your case and wipe down the metal with Crc 2-26. Wd-40 (water displacement #40) will work just not as well. Desiccant is the same stuff used in your air dryer/filter for the the high pressure pump or often found in stuff ship over sea's. It too has a shelf life, based on how much moisture it has been exposed to. But can be dried out with some thing like 250 degrees of heat. But don't quote me on that. M Man Good luck
 
Certainly Ballistol - its probably the best all purpose oil one can get. 

If you often take the gun out in rain, you might consider wiping it with Nano Protech gun oil. This really makes the water pearl off but Ballistol also does a great job keeping water out. Rust mostly comes in storage, for example when you had the gun out in cold weather and then put it somewhere in a corner the air will condense on it. The best way to prevent rust is to put on a thin coat of Ballistol about once a month and have the gun stored in a sheath.
 
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"deucelee"
"rich177"Having a safe has nothing to do with it. I have a safe but run a dehumidifier in the room 24/7 in the warmer months. You just have to remember to empty it. It is just amazing how much water is in the air. Wipe your guns down as well every time you handle them.
When you say empty it, do you mean empty the air tank? or the safe?
Empty the water out of the dehumidifier.