Liquid Fusion is an extremely versatile glue for the fly tyer. Here at Dakota Angler & Outfitter there is always a bottle handy.
Liquid Fusion is a water-based urethane glue and is non-toxic.
Use an epoxy substitute when making top coats on the backs and wingcases of nymphs (i.e. Copper John's and Mike Mercer's Poxy Back Flies). Liquid Fusion also works very well to coat adhesive backed eyes on streamer heads.
See Liquid Fusion in action at the fly tying bench in our videos: