I live in Ohio where it is as humid as the Amazon Jungle in July. The only thing that prevented rust was a stainless gun or a hard chromed one or a nickel-plated gun. Years ago when prices were all not a complete and outrageous rip off I once had two blued .380 autos and a blued/anodised .25 acp and was going to have them hard chromed but the fellow that did such work talked me out of it and said electroless nickel would adhere to both the inside and outside of the gun while a hard chrome finish would only adhere to the outside of the gun. The only disadvantage he did not tell me about (which I already knew about) was that nickel finishes are not as hard and durable as chrome but I went ahead and had all the guns electroless nickel plated. The .25 acp has been carried every day for years even at home in a pocket holster and even in my jeans on the floor when I shower and you know how humid the bathroom gets during a shower and after all these years zero rust on the .25 acp. The electroless Nickel has not peeled or chipped either.
By the way I have never found "any wax" that prevented rust on blued firearms or on carbon steel knives, in high humidity environments, none whatsoever, or any oil for that matter as it soon evaporates or runs off or gets wiped off and carrying a gun slathered in thick grease is not an option for any normal person. Grease is fine for storage but not carrying. I know I have done it when hunting by putting it on my shotgun or rifle. Not the best solution unless you have no other option and do not want or cannot afford to have the entire gun refinished in chrome or nickel which has never been cheap, especially with today's outrageous prices for just about everything in the gun industry. I know the last price I checked on to nickel plate a pistol was north of $300. Its cheaper just to sell the gun and then buy another gun in stainless.
