Wow just read through most of this thread. Some different view points to say the least,,,,,Guess I'll just go ahead and throw in another rock in the pond. I am I the only one still making my own glue? I just the the sinew scraps and trimmings and throw them in the crock pot with some water over night and by morning Good pure sinew glue. Use what I need, put the rest in an old butter dish and throw it in the freezer till the next bow is ready When I first started doing it I was concerned because it didn't feel super sticky but I after testing was a believer. It's rips the wood before letting go. As far as waterproofing I agree with Justin it is what the finish is all about.