I use for applying Bishops Original Tear Mender to my streamer flys when building/setting their heads.. Makes it very easy to apply the liquid rudder Fluid right where you need it... Would highly recommend this handy liquid applicator device for completing the task.

The best application I have personally found for the bottle is Tear Mender. Tear Mender generally comes with a twist cap that drops out a generous amount of liquid that often proves to be too much for fly tying applications. If you’re conscience about not wasting, the application tips are perfect and you get the exact amount you need everytime.