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I only regularly carry three of my 1911's and the experiences with each is different.

The LW Commander was recently coated with NP3. It has since shown absolutley no signs of rust. It's smoother than before and clean up after 1000 rounds requires little more than wiping it with an oil soaked rag.

My Kimber Classic Custom has been a workhorse for nearly eight years or so. It's a plain chrome-moly gun that used to rust while you watched in high humidity. Since being hard chromed, rust generally isn't a problem. May be it's an inconsistent plating but I swear hard chrome can and does rust if the gun is "dry" in humid environments. I wipe this guns with clean, but oil soaked rags and have never actually found rust on the rags. Still, the chrome looks better with a light coat of oil. Otherwise, this is a recommended coating.

My stainless Colt Goverment Model doesn't seem to have any major rust issues except when it's very dry in a humid environment. So keeping the rust off is similar to my experience with hard chrome with the exception of the fact that I can use a "ScotchBrite" pad to remove any surface rust without fear of damaging the surface. Having said that, I've got a stainless Combat Commander that I swear will rust faster than any "blued" gun I've ever seen. That gun knows the "ScotchBrite" and Hoppe's metal polish compound very well.

Not sure if any of that helps, but that's been my experience. If I know I'm going to get particularly sweaty in warm/hot and salty environments, I just given to the dark side and carry my Glock 19. I've seen rust on that gun too, but somehow I just don't care as much. Not saying I don't clean it immediately...It just doesn't irk me as much to see a rusty Glock as it does to see a rusty 1911.