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.The DC finish will definitely rust easier than Satin. It is because the little tiny craters created by the blasting media collects and traps moisture.
I agree with the need to protect the talon hole, but I think the reason that they rust in first place is because they're not finished. I've never seen a Busse yet with the inside of the talon hole polished.The talon holes I think are susceptible to rust because of their shape and location. They are always near the sweat of you hand and they are perfect for collecting a bit of moisture. Be proactive and take some marine tuf cloth and use a qtip to push it through and swab it around.