[Paul Philco322]

There are clear epoxy products on the market, I have not used them no experience. I have primarily used epoxy on bakelite cabinets on the inside to secure cracks or do a repair with good results. I usually put it on thick and even with the clear that may not look good when dial is lit. 

You could always do a few tests on similar materials and see what you think before you do on the dial. Good luck.

Paul