My luck with Liquid glass wasn't so good. Made water-like stains that only came off with NXT wax.
Couldn't even scratch them off with my fingernail.
I also found the NXT had a better gloss and left the paint feeling smoother.
I know Will and others have had outstanding luck.
I will say though, that I went to a do it yourself bay for the pre-wax wash. I didn't use dish soap or anything to remove the old wax. Maybe that was why.
I wish you luck ...if your luck with it is as good as Will'* you will have two gorgeous Bonnevilles (not that you don't already).