yah, i agree with the others. no additional rust proofing necessary... and if some random rust proofing shop sprays inside the doors chances are they will BLOCK the drain holes making it worse. aluminum does corrode but not like steel.
especially if you're going to store your Z in the winter you'll be fine. my 7yr old G has been driven on dry days in the winter time over dry salted roads...unwashed until spring. not much rust anywhere on the undercarriage. absolutely no rust on the panels.
just keep it dry.
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