The book titled, "Model A Ford construction operation and repair for the Restorer", contains an interesting comparison between Ford and Chevrolet on the page preceeding page 1. Bonderized Protection vs. Rusty Fenders.
Ford fenders and other enameled parts are Bonderized to prevent paint peeling and the spread of rust from metal points exposed by accident.
The MAFCA paint and finish guide states on page 3 that the body was spray painted with nitrocellulose lacquer. Fenders etc. were dipped in Black enamel.
Ford did not make an effort to paint the underside of the floor pans, wood, or sub-rails. They have been found to be, most often, raw metal or red oxide primed steel with some body color overspray.
I believe that the red oxide referred to is the Bonderized Coating.
During the disassembly of my 1930 coupe I found a hardened tar like
material inside the doors also. This was no where else on or in the body which led me to believe that the reason for it was that the door would have a more solid sound when it was closed. It was put there as a damper for vibration.
I have not had the opportunity to view a copy of the Judging Standards as this might be covered more thoroughly there.
Maybe some of the Ford Barn members have more intimate knowledge of this also.
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