Broadwing,

Hot glue has lots of uses. Epoxy does too. Different materials for differing applications.

I like hot glue for bodies on zonker type flies, eggs, and for making round 'heads' when I want the fly to sink but not too fast, and have a place to add nice big eyes. Faster than epoxy, less mess, and very durable. Comes in a wide range of colors.

Get BOTH low and high temp guns. At around $3 each you'll find a use for both. The high temp gun gives a better bond and clearer results, but for some things, where too much heat can damage things or you want LESS time for the glue to flow, the low temp gun can come in handy.

I primarily use epoxy as a coating, which hot glue just isn't suited for. You can't beat epoxy for covering foam, adding a 'lens' effect to eyes, wing cases, etc.. Hot glue might damage materials, and it's not as clear.

Fun to experiment with. I'm not sure how it will work on a Copper John, but I'm looking for some really clear glue, and if I find it, I'll certainly give it a try.

Good Luck!

Buddy