It was an option, my '53 was one of them luckily!!hilltop170 wrote:I have no way to confirm this but I think most airplanes left Cessna with no corrosion protection/zinc chromate primer whatsoever. The "Alclad" skin was supposed to be corrosion resistant. There was black sound proofing sprayed randomly in the cabin roof and aft fuselage of some planes, which is almost impossible to remove today, but I do not think it was intended to be corrosion protection. Float planes were the only ones that I know of that were treated at the factory. It might have been a factory option for non-floatplanes.
Joe
4518C