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Re: Half painted Fw 190 wing undersides - the purpose?
Well, British findings following investigation that started when first such US aircraft appeared stated that there were no performance gains, and although finish was much easier to maintain, there were several drawbacks. There was a pressure from US industry to drop the camouflage, but decision was not taken until late 1944. This is discussed in Paul Lucas book on RAF markings 1945-50.
Another point is that Mustangs had their wings puttied and painted even in NM finish - certainly not without reason. Puttying was quite common, at least at some point during WWII, eg. Spitfire was puttied, although it is not often visible.
Certainly there were differencies between US (Du Pont?) finishes, British ones and German ones but I think you overestimate the effect. The bits in original paint I have sen or I owe are not representative but judging by photos, if RAF aircraft were properly maintained, there were no dents but some on walkways and movable panel edges plus a lot of discoloration, this after months of flying.
Regards
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