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You need to be careful about using two different metals
together. There is a thing called electrolysis that takes place with dissimilar
metals. Aluminum being the softer metal it will be attacked first. If you want
to make a cutout to get inside that's fine. Why not use fiberglass to cover the
opening when you are complete with your rust proofing. I'm referring to the
fiberglass matting, not Bondo / Body filler . Fiberglass is not
effected my electrolysis. It is relatively easy to work with
& easy to sand if you need to shape it. You could also use the piece of
metal you cut out as a filler & fiberglass it in place.
George
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