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Looks like the mastic they apply, usually by long arm applicator/machine,
that is supposed to help seal the body panel "skins" where they meet and
add protective cover to the welds...looks like a thumb/gripper print
in one pic. I tend to agree it is pretty shoddy "workmanship", but not
sure what you will get the stlr to do, unless he takes on bodywork.
GL,mD
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