Sometimes just a little tweak and change and results are different. I noticed with my 40fs back about 1 1\2 years ago after about 6 moths of owning it, a bit of rust on the frt of the slide where the holster wore the finish off. I didn't freak, I grabbed my trusty little bottle of Militec-1 oil rubbed it into the spot until the rust was gone. Since then, during the hot ugly summer, I pay a little more attention to it and rub a drop or 2 onto the slide when I'm sitting there tinkering with my toy.

If someone is having continual trouble with rusting, oil it, if that doesn't work, find the right oil.

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Jack C