What is the door "skin"? That could be the internal $1 piece of plastic to prevent moisture inside the door panel? I would not get your knickers in a tivy yet. Find out exactly what he did. I doubt he will re-sand, paint , etc, the door in one day.

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'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)