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Message: <blockquote data-quote="Adfalenski" data-source="post: 1461234" data-attributes="member: 21752">The plastic is a rain barrier.  It keeps the water that leaks past the window seals from coming farther into the door panel.  Usually the bottom of the sheet of plastic is tucked into slots near the lower edge of the door to direct water back inside the door away from the inside door panel so that it can drain out the bottom. There are also drain holes at the very bottom of the door at the pinch-welds so the water does not pool in the door and rust it out from the inside.  These holes need to be kept clear to prevent door rot/rust starting from the inside bottom edge of the door.    I would recommend the non-hardening body caulk strips from 3M to hold the plastic on the doors.  Considering the age of these cars, eventually you are going to have to get back inside the door to replace glass, door lock actuators, window regulator, etc.</blockquote>