In my youth, I riveted aluminum to the wheel wells of a 144 to repair some rust. Then Bondoed over them.

It lasted a few years, but it seemed like that set up some kind of electrolysis because the aluminum then started to corrode faster than the surrounding original panels. Especially where the aluminum was in contact with the existing body panel. Weird.
I guess my takeaway was to only used steel on steel or aluminum on aluminum. But it also depends on what you expect to get out of the repair.

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"Differences of opinions should be tolerated, but not if they're too different' - Sharon Craig