Ziebart has a good reputation in the anti-rust field, but I'd be VERY careful of foams in the rear subframes. That was a semi-popular 'upgrade' in the early '80s, that turned out to nearly destroy a few cars. The foam used was polyurethane, and like all foams, it shrinks slightly over time. Water then channels around the foam to sit forever underneath it, in contact with the frame bottoms. THe foam prevented it from evaporating..... The affected cars rusted through the bottoms of the subframes, and had to be extensively (and expensively!)rebuilt.
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