I did it this weekend on my car, removed swirls with #82/#9, then topped with #7/#26. VERY wet look. I've been told that #9 and #7 both add about the same amount of oils, I would see what you think it looks like after #9, then decide if you want to add #7.
I always use #7 PC after #9 if I'm using it with #26 Liquid PC on my black truck. I use Hand Polish too (i.e., on my vintage BMW motorcycle). I'm having a hard time deciding if #7 and Hand Polish are true "equals". I'm one who never has a problem with #7 skinning/removal because I always use it as thin as possible I guess. It is my opinion that it is a very excellent light swirl filler and leaves a rich look to the finish. I'm a huge VM fan but think #7 fills A+ and VM A-. Others that work VM a little more to remove very light swirls might dispute this. I sometimes don't see all the light swirls when I use VM but I never see them AFTER when I use #7. Your results may be diferent.:nixweiss
Putting a glaze on after polishing but prior to waxing is one of the most common ways of doing things! A "traditional" detail very basically goes: Polish --> Glaze --> Wax
Definitely glaze if you're using a carnauba wax and if you want to maximize the appearance. It certainly makes a difference.