I’ve noticed that Testors/MM metallic paints, particularly aluminum and steel never really look right in scale. The ‘flake’ or whatever you call it is really too large to be realistic. I know Alclad/Metalizer does a better job, but they aren’t practical for detail painting. So the question is this: Do any of the other paint manufacturers produce metallic paints that are more realistic than the Testors brands?
I like Citadel acrylics. Some of their metallic colors have very fine pigment, but others are somewhat on the large side. I’ve also been known to airbrush even a single small part with Alclad when I want a good metallic finish. Takes a little time and effort but the results are worth it.