I have to agree with Keenan. That was good info on fish bladder glue, but a waste of sinew. Not only did he not soak the sinew, he didn't lay it down flat and smooth so the sinew isn't giving 100%. For those asking about waterproof, look at the end of the video. See how rough the sinew surface was. It will catch and hold a lot of moisture that way. If it was combed and laid flat it would be much better. A snakeskin over the top would provide a lot of water protection for it.