Caulk

DFX 340 Duster said

I have found sealant and filler material on some of the seams of my convertible. It has the paint from the factory covering it which indicates that it was part of the build/assembly process.

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Seam sealer is a normal thing, this was slathered between the lower quarter & trunk extension. This is what made the car rot........they put a drain plug on the extension then they put crap in there that will hold the water...that makes a lot of sense