Heck I had some rust issues on a "Stailness" Kimber 1911, its not made of a truly rust proof metal such as H1 or Stelite it is susceptible to rust under certain conditions. I recommend this stuff to everyone with these particular issues it works very well.
I like to use Sentry Solutions' "Tuf Glide" on my blades that don't get used every day as a light rust-preventative measure. Seems to work well, even has a somewhat pleasant scent.