You should be able to get the humbrols to work well for you. I find they make pretty nice metallic colors, and that the metallics mix well with any matt color…
But the stuff I’ve been using doesn’t look anything near what they are showing. The bottles I’ve had are much more brownish metallic and burned looking–not at all like the sample in the link above. It’s possible Testors changed things since I bought any.
Mix the brown with black till you get a very dark color then add a drop of silver or steel and mix, you will get a metallic rust color. I personally like the MM Burnt Iron Non Buffing Metalizer. I still it very well and hand brush several coats that produces a realistic shade. It will last you for years.
I mixed black, brown, silver copper and even some red.
You can’t really see it in the pic, but it has a slight reddish tint to the “gunmetal” look.I have also (unsuccessfully) tried to drybrush on a coat of light grey to the second to last stubs to simulate the leadstaining from the Avgas.
I paint the exhaust strip first with flat gray primer. Then I dry brush some Testors Steel, just a very light patina tint. Then I do the same thing with a medium brown or rust color. I also touch up the inside of the stacks with flat black.
I use a mix of enamel & acrylic. A base coat of gun metal enamel allowed to dry followed by a coat of a rust coloured acrylic which I wipe most of off with my fingers before it is fully dry. It dulls the metallic coat down & the more you rub off, the newer the exhaust looks. Then a bit of black or Tamiya smoke to soot it up.
First paint them XF-1 Flat Black. Next paint them XF-64 Red Brown. Dry brush with silver enamel (I use Floquil Old Silver). I then give them a black wash if they’re detailed, but this is optional. It leaves a nice burnt iron look. Works for me…
Hey Theums. Go have another look at those Korean War P-51 photos that I posted the other day. Those exhaust stacks did not look overly discolored in those photos. And those were some very well worn Ponies…