Originally Posted by
bibliobob
I'd wheel it into your local hobby shop and see if you can find some model paint to match the colors....
The way that badge was fabricated, attempting to touch it up will probably just make a mess. there was no etching of the base, just registered silk screening. The colors are transparent here and there.
As advised, NOS badges go for silly amounts on ebay. I suggest also that you use what you have.