I washed the piece, primed it in ultra flat camo black (rust-oleum), then drybrushed it with silver acrylic miniature figure paint. I gave it a satin clear coat (krylon). for the gas tank, flatbrushed it with silver and chipped a few bits to give it a dirty look. the rear axle housing was painted in a red ink wash, to give age to the color.
I made it look as though it was restored, but not by a -complete- professional. Think of finding this in someone's garage, and it had been a on-going project for them.
And thanks for the pointers! I ran out of black pigments for my black wash, so it will be a bit before I can touch it up... but for the most part Black Venom is done.