I use Super Shield, made by MG Chemicals. Its a nickel based paint that's easy to use, and doesn't cost the earth.

Mind, that's a relative term. Here in Calgary, its carried by Active Components for about CDN$36 for a 12 oz. spray can. Enough to do 4 - 6 guitars.

You can't solder to this stuff, but you can make a good connection with a wire and a screw & washer.

Good luck! :)