Heads up, I just got a five food thresher shark (?maybe?) off the coast of Taiwan and had a hell of a time skinning it. I mean literally, it was hell. It took me hours and hours to do. The skin is super tuff and almost impossible to cut on the first go. Underneath it has a thick layer of sinew and some other sort of strong material. I am not sure if this material can be separated from the 'skin' itself, which is very abrasive. I scrapped it for hours and was only able to get the sinew off it. It is air drying right now. I think it may be too thick to back a bow without gumming up its performance, but I imagine it would make a good strikeplate and an excellent hand guard or a 'no slip' handle wrapping. Let me know how it goes! On the plus side, my aboriginal friends made some great dishes with the meat using chili peppers and celery.