Yes. According to Nick Sutton's book, the inside of the panels were painted with lacquer so that the gold would not adhere to them during the electro plating process. However, due to time constraints, one door was not lacquered inside, and thus is completely coated in gold. All the DeLorean books paint a pretty entertaining picture of pulling off the gold cars. The panels were snuck into the factory in a refrigerated truck, etc.