Super glue under delicate materials like peacock herl, pheasant tail fibers, tinsel, etc., before I wrap them.
UV resin over bodies made with biots, hackle stems, stripped peacock, thread, etc., to bring out the colors and for protection and also on wing cases.
Sometimes I'll put a drop of super glue on the-tie in point for uncooperating deer, elk, and squirrel hair wings.
Super glue painted on the thread before whip finishing.
Obviously, I don't use head cement much any more. The UV resin has taken over a lot of applications where I used to use it.

Joe