Try it and see. Sometimes I've had minor bonding/smearing issues when using UPP over other products that have good protection in them but a) it wasn't a huge deal, just give it more curing time before buffing off/buff a bit more and b) I never tried the UPP over VM.
And I *like* UPP for winter. All the abrasive crap comes off very easily due to the UPP's slickness, less chance of marring during the wash.