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Registered
Join Date: Nov 2021
Location: The Far Side - Chicago
Posts: 1,278
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I’d call Ziebart HQ for technical advice.
I was looking it up and Ziebart says the tar substance can be up to 10-12mil thick. It looks as if some of the overrun drips have de-laminated, so if the 45 yr old goop probably lost its flexibility and the substance being that thick, maybe use either CRC freeze-off ($$$) and chip it off or use a heat gun to soften to scrape it down to the metal then clean with a solvent and ScotchBrite pads.
Chip a bit off and see what dissolves it best before going through various chemicals. Again, Ziebart should have some idea how to deal with it.
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