well being in the air force ( and being a crew chief ) i have found that in most cases in the field we use what paint we can find that is the closest to what the plane came with, i know in WWII that most fighter units did the same, the crew chiefs probably covered the areas with whatever black paint they could find if the area of stripped paint wasnt too large . If you look at modern navy aircraft you see the affect of spot painting over small areas that need corrosion covering from paint. Rigolosi