What we're missing here is the yellow zinc chromate primer.
For an aircraft like the Phantom, I'd spray an all over coat of yellow zinc chromate. Its a standard metal primer on aircraft. The WWII zinc chromate was green, the postwar stuff is yellow.
If you get up close to some aircraft from the Phantom's era and get a look at the edges of landing gear doors, wing leading edges or any contact point such as hinges between to adjacent painted surfaces, you may see some bright yellow showing through, thats the primer.
Heavily used aircraft may show quite a bit of it. British Phantom's were an excellent example of that. If you do put down the zinc chromate under your main colour coats and find out the paint wear patterns on your aircraft, you can take some very fine sanding film or steel wool and gently rub back the surface color to expose the chromate to the appropriate degree.
A similar method to that was featured a couple of issues ago in FSM in an article about weathering a Helldiver. In that case the method was being use to show wear and paint fading on the tail control surfaces. Going through blue to get at a white undercoat to simulate fading.
The same concept is at work in what I've just described regarding the zinc chromate.
Good luck