I took off the plastice main spring cover on my Kimber several months back and replaced it with a steel one with the integrated speed chute from Wilson Combat. My complaint is that the oils from my hands rust it. The rust comes off easily with some Hoppes and a toothbrush, but what would you guys suggest I coat the steel with to keep this from happening in the future? I am also going to replace the standard MIM safety with an ambi safety. What brand would you guys suggest knowing that I want to get away from MIM, and I haven't been all that impressed with the Wilson Combat stuff so far?