That's amazing.
Can I send you a pair of Valiants to have you put on the finishing touches?

Thanks everyone for your comments on my Batmobile!
The technique I have used for painting the fine details is to get the body primed, sanded and painted with the base color. Once I am happy with that, I apply a couple of coats of clear gloss. I then use the cheap acrylic craft paints from Michael's or Hobby Lobby for the bumpers, tires, wheels and other details. One of colors I found was a metallic silver that works well enough for chrome trim.
I'll use a really fine brush or a wood toothpick carved to an extremely fine point to apply the paint. I try to get the initial application (like the Batmobile stripes) as good as possible, but there is always some excess paint that happens. I use another fine pointed toothpick (and a steady hand and a magnifier lamp) to carefully remove the excess paint. I'll do this while the paint has not dried and is still soft. Not a lot of pressure is needed. The gloss coat helps to protect the base color from getting scratched off. If you don't like the results, the still soft paint is pretty easy to remove with a damp tissue and you just try again.
When all of the detail paint is done, I will spray some semi-gloss clear over the model to help seal the paint.
Chicken45 - I'd be willing to help with the detail painting on your Valiants. I have followed your posts that detailed the work you've done on them and what you've accomplished looks really good! I'll send you a PM and we'll see what we can work out.
Thanks,
Bart