Thanks Jeff and Corasnake,
I think my car originally has red interior.
And exterior color?
1. How and when exterior paint color go to firewall and front floor area near firewall, overspray from exterior or direct paint?
Indirect. Remember that the guns put out allot of overspray in those days. So for the areas we're focusing on in this thread allot of the paint in these areas would come from painting the forward door jamb and top of sill/rocker panel
2. painting doors interior was done before or after exterior body painting?
Before then like the dash masked off with a precut mask. Reason the center of the doors (behind the door panel) was typically body color
3. door front area, seeing from front fender get only overspray, from door exterior, side cowl and A pillar painting?
Car was "jambed" first so areas surrounding the door and opening as well as trunk then the exterior including the side of cowl, A pillar and front surface of door and hinges
4. rear area to B pillar side as bottom area all with exterior body color get paint with exterior paint or earlier or later?
Part of exterior paint process but at the beginning. Not sure if there were three (one for trunk, and one for each side of the car or two guys doing it
5. Doors were half open or fully open when body get paint
Doors were pretty much fully close but with a fixture kept from the metals of the door and body touching one another. This would allow for the cars painted with metal flake to "lay" right and the paint coat to be consistent
6. Interior was isolated on all windows, windshield and rear glass to not have overspray inside the car.
Plenty of direct and indirect application of paint through the openings as the painters sprayed the edges then followed up with the painting the rest of the surfaces. If the spray pattern was maybe ten inches wide, for example, in some areas two inches with cover what they were trying to coat while the other eight inches went into the cars interior. Most of the time the areas best covered would be the surfaces directly behind where they were aiming and on the more hortizantal ones and the paint moved into the interior cavity and floated downward. Further distance or more vertical the thinner or lessor the paint overspray often
7. ROCKERS panel get paint with doors open, so maybe missing some paint near A pillar
Top of rockers (sills) when the door opening was painted then the outer surfaces down to the pinch weld, with overspray onto the undersides of the body in following passes after the door was almost closed as mentioned above
8. Inside truck get paint same time as Exterior body?
Same line and area just before.
9. Rear floor area (under rear seats) get overspray from trunk inside painting
Typically got some paint from doing the door jamb and then from the paint that was directed towards it or overspray that floated down through the rear window, side window or other openings
As for the video check out in the one Pete listed above for a general idea of some of the process at Dearborn that year