When you are done layering the SG you could use either one of those QD's in between wash's. I don't know if those two QD's have wax in them or not, that would be your only concern if you were still in the process of adding more layers of SG.
Sonus Spritz or Glanz are both acrylic product that work hand in hand with Klasse products , which are acrylics . Both Sonus products are easy to apply and remove .
Another vote for the Sonus QD's. At a Meguiar's seminar I attended we were told the the original QD is fine to use on a sealant. It doesn't have anything harmful in it that would damage it. I can't recall if anything was said about the NXT detailer.
Does anyone who attended the Mississauga, ON session remember is Greg Morton said anything about it?