Okay, if you're on Facebook I'd look up 'NZ Lure Fishing' and ask that community a question.
There are a lot of people on that who make their own lures, and should be able to give some advice on paints, finishing coats etc.
My other suggestion would be to talk to a car painter. They know a lot about painting metal to last in harsh conditions. Maybe a lacquer type top coat they know of you can get at Repco or similar?
If you've got a lot to do, my thinking is that you'd want to work out a system of hanging them all through the leader loop on a single stiff wire, or thin metal rod, or similar, with something like an old sheet behind them, and spray painting the lot in one go (for example, hanging off the clothes line in the back garden).
Or if you want to have say lumo on one side, and metallic orange on the other, you maybe can fix them to a big piece of cardboard and spray all of them at once on one side, let it dry, then turn over and do the same on the other side?
I don't think epoxy is going to be a realistic option as the final coat.