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tirwin, I would use the POR15. If you're going to cover the metal with something, it may as well be POR15. It hardens sort of like powder coat. It cures from absorbing moisture from the air. When I removed the undercoating from my car, there were spots where it was loose and could collect moisture. So I undercoated the whole pan bottom with POR15. It was roughed up from the removal of the undercoating and I put on a fairly thin coat of POR15, so I'm optimistic it won't separate from the metal anywhere.
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Marv Evans
'69 911E
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