I have no doubt this question has been asked numerous times.
I have just primed my 1/48 monogram B-17 in glossy black.
I have seen B-17’s at airshows. I’ve watched YouTube videos of production plants during World War II.
I have done a few tests with Krylon and Rustoleum aluminum spray paint and silver spray paint. I really do not want to use Alclad because of the amount needed to paint this B-17 and my paint booth isn’t big enough.
However neither are that “shiny look” that I’ve seen in the YouTube videos at production plants or at airshows.
I just bought some dupli color chrome and a can of there aluminum to test.
Would I be going out of bounds if I use the chrome for the shiny look?
I think that your decision is based upon if you want to depict a current warbird, or an actual WWII combat aircraft. During the war, the NMF aircraft tended to get dull rather quickly due to exposure, and ground crews did not polish them up.