I use Crazy Glue on all my saltwater flies
A good example would be a deceiver
... after the tail (Lefty calls it the wing) is mounted, those wraps are glued
... then a thin layer of the glue along the shank before the body material is wrapped
....the base of bucktail collar gets a generous dose as well as the final wraps/head
A solidly built fly like this lasts a good long time
The simpler the outfit, the more skill it takes to manage it, and the more pleasure one gets in his achievements.
--- Horace Kephart