Tony
A lot of the trainers were all, or mostly fabric. Even the most advanced aircraft at that time had fabric control surfaces which require dope not paint. The engine cowls on Tiger Moths, Ansons, Wirraways etc used paint but often the whole lot was just hit with dope which is not a perfect coating for those surfaces.
I think you might be right about using the standard paint on metal surfaces. It certainly was not long lasting as you can see from colour aircraft photos. Aircraft always got scruffy quickly until the advent of two pack paints in 70/80 period.
Lang
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