Yeah, as Stevet said you can use most any carnauba over MP, especially paste waxes. I've used UPP over (regular, pink) MP but got some sorta-minor bonding issues. Nothing really *awful*, but more wiping and a longer cure time were required. No such issues over the *Pro version* of MP, which still contains wax, but not as much. I just put another application of UPP on the S8, which had Pro MP as its final polish. No problems at all.
I guess I'd approach UPP-over-Pink MP cautiously, maybe wouldn't try it at all on a dark vehicle. But it occurs to me that I tried that combo with the previous version of UPP and the new stuff does behave differently- I *think* it will now generally be more compatible with underlying products.
And when it comes to the preference, I actually prefer the *look* of UPP over 1Z polish (on my silver S8) over every other product combo I've tried on Audi silver. The slickness is just an added benefit. Heh heh, with all the silver Audis we've had and all the LSPs I've accumulated, that's saying something! But it's just *my* preference; my wife prefers carnauba on *her* silver A8 and neither one of us likes the look of good ole KSG on Audi silver- just a matter of how *we* want 'em to look.
