I had this question too, a couple of years ago. On Dwayne's advice, I used UPP over RMG with good results. I also applied NB on top...but I did wait 24 hours first. That said, I have seen it reversed - RMG on top of UPP - and the instant gratification results were stunning. Accordingly, I think I'd take VTechFan02's advice on this one.
The question I always have with glazes - what's the reason for applying? In my case it was to fill in some remaining uglies and to add a bit of wetness. My over-two-year-old bottle of RMG is still nearly full, as is my newer bottle of FTG (impulse buy when I was going Menzerna happy).