It looked like the frame rails were first shot with red oxide along with the rest of the unibody. Then the core support, engine side firewall, aprons inside and out, were shot with black - basically looked like the painter moved around the front end of the car and shot everything black from the firewall forward. There was also some sound deadener sprayed on fender side of rails and aprons in a few places. There were still a few places that the red oxide showed through on the front rails, including on the fender well side in a couple of places, but not much. The yellow grease pencil marks were on top of the black. The dark gray covered everything completely from the floor boards on back, including the rear frame and underside of the tunk floor - there wasn't any red oxide visible in those areas. I also owned 5R08U108459 which didn't have any red oxide showing up front, and had less sound deadener, but was otherwise similar.