Thanks for your thoughtful comments Jay!
I don't mean to be a wise-ass about rust bluing knowledge, you can get hundreds of tips and lots of instructions right here, some that even work. It's simply an experiential process, with no two jobs alike and not always predictable results.
I have found it quite easy to rust over existing blue, but also usually find that the surface isn't as good as it looks, and almost everything needs to be polished.
Have you got the new book? (Double Guns & Custom Gunsmithing) Both books have a lot of information about metal finishes.
Sauer's are some of my all-time favorite guns!
Best,
Steve
