So the reason to use acetate floss is that when hit with acetone it melts into a smooth shell? Hundreds of videos I've watched and not seen the technique used yet. Will try a search but I use acetone to clean up around the table.
edit...One nice thing about Google is ask and you shall receive. I asked for acetate floss fly tying and after looking at a few of them it does make a nice, smooth hard shell type of finish for the chronomids and nymphs I saw tied. Don't know as it would look a whole lot different in the water as the same tie done with silk thread or floss and coated with UV.