Early Barracuda body cracks under rear window

Idk about the first gen so much but the seams on my 67 are HUGE. I would not feel comfortable filling all of that with plastic filler. There would be corners built. I can get some pics of my 67 tomorrow. It ain't pretty.

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Virtual no weld holding from the factory^^^
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Silicone bronze ^^^
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Steel wire before I got a tig welder ^^^ so I could use silicone bronze and other metals.