Jurgen, wich aircraft do you refer to?
I was hoping somebody more knowledgeable would answer your question. But at least German Albatros fighters were painted with spray. In a question about the green and mauve pattern, the great expert Dan San Abbot said in his reply
Quote:
DSA
3. The Albatros Werke used spray guns with pressurized covered pots, Defilbis spray gun system.
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The majority of WWI airplanes seem to have been painted by hand, I think the use of spray guns used by the Germans must have been dictated by the necessity of economizing in paint due to shortages caused by the blockade, but that's just my theory.
Regarding national markings ... from another thread in the Aerodrome, the German crosses were painted by hand using stencils.