I started making my tackle for the same reason, cost and availability of Eakins jigs!
Powder paint when cured is as tough as you can get so there is no need to clear coat. Just go to Big Lots or Ollies and get a small cheap toaster oven to cure the heads after powderpainting them.
Here are a couple more tips for making those Eakins jigs. Pour with the base hole pins in not the weedguards. After curing the heads then glue in the weedguards afterwards with super glue GEL (very important to use GEL!). Eakins uses (or use to its been awhile since I bought any?) 3/0 hooks, I found these do not work as well as the 4/0 which seem stronger and lose less fish.
Allen