Wrong forum, sorry. Should be in the University. Next, yes that will work, but wouldn't make sense. 81 is what Meguiars considers a pure polish, meaning it has no abrasive qualities. This is basically what everyone else calls a glaze that hides imperfections using oils. The AIO is going to remove these oils, so it would simply be a futile step. If you need to get rid of some swirls, I would suggest 82 or 83. Then AIO, SG. Theoretically, you could top SG with 81 if you'd like.