Maybe this should be in the paint and finishing thread? But it applies only to WWII aircraft, and restorations/replicas, so I'll put it here. Called Pacific Fighters yesterday, in Idaho Falls. They do more P-51 restorations than almost anyone else. Asked them about paint...and was told to use flat paint, not metallic. Every P-51 that rolled off the assembly line had flat paint, either gray/OD, or plain aluminum (fuselage). They recently restored Berlin Express, all original and authentic with flat paint. It is gorgeous! I don't care for the ultra shiny, polished examples that you sometimes see, because they did not look like that in 1942-1945. In the field, anything and everything was done. It's a highly personal thing. Some like shiny, some don't. They recommended for base color (wings/fuselage) the color Krylon Dull Aluminum (flat). It comes in a spray can, and the idea is to match it.