Looks like there could be a diference of opinion on what QD's work with UPP.
As has been said, both #51 Final Detail in the tan bottle and Quik Detailer in the maroon bottle contain silicone. Because of that, I wouldn't use either one when I was planning to use more UPP in the near future. Again, as has been said, you would probably be OK since it would wash off pretty easily, but why take any chances?
For me, 4 Star UGE would be the QD I would use with UPP. Before I purchased the UGE, I did use Meg's #34 Final Inspection in the tan bottle (no silicone) with no apparent problems.
The UGE is one of the best looking QD's I have used and since it is compatible with UPP, it seemed like a logical choice. :dunno
Charles