Try Brownell's. They have several bake on coatings, from baking lacquer to teflon moly coatings in a bunch of colors. I have used them all gunsmithing before I started knifemaking. They are easy to use and are fairley durable. If you are able to bead or aluminum oxide blast before coating they last better but a 100 to 150 grit finish works also. Also your friendly neighborhood kitchen oven is all you need to cure them. www.brownells.com/index.html
Good luck and have fun. Fish