Osage, even after removing the scales there is a waxy film that remains and you have to scrape that off with your finger. But you will never get all of it and the problem is that regular finish doesn't adhere very well to this film and results in micro cracks in the finish. The cracks don't affect the performance of a bow at all, but I'm kind of picky about how my finishes look. It used to drive me crazy until I figured out the super glue trick. The super glue permanently fixes the remaining scale fragements in place so they won't be a problem and when covered with a primer coat of shellac, the finish will adhere perfectly - problem solved. Also the superglue helps preserve the original colors of the skins.
Cameroo, I purchased the Titebond CA from Woodcraft. They are a wood working supply chain store.