The silk screen sounds interesting. But I think I would take the jpg image to one of those computerized engraving kiosks in most large shopping malls. Maybe they could engrave the design into your scale. Then paint over it, sand and polish so that the surface of the scales is re-exposed but the paint remains in the engraving. Buy some polyester or epoxy resin and hardener, (fiberglass resin) mix a test batch and brush it on to a spare bit of scale material to test for adhesion, gloss, etc. A resin sold as an actual gel-coat type resin will be best. When you are satisfied you can get good results, apply a coat of resin to your scales and let it cure in a dust-free area. This gelcoat will protect your design and add a depth to the luster of the scales. Polish with a cloth buffing wheel at low speed, and you will have scales to be proud of. JM2C
Banned for Life from "Over There"... TWICE!