As far as I can see, the only way the rusty fingerprint would show up is if someone had touched the surface after cleaning the journal surface when the engine was disassembled,,,,Fred T. ,,have you fingerprinted yourself lately :p :p grin
I suppose ANYTHING is possible.
I think J.H. and I could work well together building an engine,, ANY engine cool

There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!