Quote: Hi Dave They also put the panel treatment (undercoat?) on before the skin was mounted. Same for the quarter panels
Hi Mauro, The panel treatment you mentioned is referred to as a Mastic sealer. It was also sprayed on prior to the door skin being mated to the door frame. That particular layer was not used for "corrosive" purposes but as a sound deadened. If that material was not applied to the large metal door skins they would have sounded like a bass drum when they were closed. The same for the quarter panels. Had the Mastic material had not been applied to that area, rocks or any other exterior "knock" would have resonated throughout the enclosed (void) areas. The black color is over spray that blew through the door openings while it was being painted at the factory.
