We used to mix hyde glue with water based paint to decorate sets when I was kid. It was also used to size or shrink muslim theatrical flat coverings drum tight. We had Saturday set decorating sessions at a park. And the smell was more like a stew than offensive. Horse hyde glue in pellets. Almost 60 years ago and I can still muster the aroma. We would also spread in on the triangle gusseds we used to reinforce the corners of the flats. We used them for many years without problems. We did a production of Aladdin which required an underground mine set that gliatened with jewels (crushed auto glass, mixed with the glue and applied to the painted flats. Man, that was fun.