This was my first beaver tail. I tried to do it the same way I do my leather wraps, but it would not form like leather.
Basically watched Big Jims video. Coated it with Barge, let it dry, recoated again and let it dry. Then coated the bow handle except the back spine, let it dry.
Then I soaked the beavertail glue side up in a dish with about 1/16" of hot water.
Then started in the throat of the handle and worked it around and it stretched out fine.