Simon;
I won't dispute the power (literally, as in electrical...!) of Galvanic Corrosion, but in the case of your those secondary rust areas in the linked thread, at the end of the chrome strip (not at the hole!) I would expect the rust was started as a result of the trim having damaged the paint (just as the clips damaged the paint at the edges of the holes) so that moisture could get to the underlying sheetmetal and go to work...I wonder how much the fact that Trim is SS and sheetmetal is steel contributed?
Cheers
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