When I first got the Rondy, I washed well and put on a coat of NuFinish liquid. Then the [new car] fever got me into more serious detailing, so I washed, clayed and used a pc 7424 to apply a coat of Meguiars NXT Tech wax liquid (ploymer). I've been following that up with Meguiars NXT Tech spray [maint] every few weeks. The surface still looks 'n feels like glass and I get good depth and reflection for a frost white vehicle. The NXT spray isn't a WOWO though, more spray, wipe, dry to haze, wipe off. (unlike DG AW for example that, wet or dry, you just spray on/wipe off.)
This is always a tough call though....do you stick with something you've used and seems to work...or do you experiment around. I'm thinking of continuing the Megs NXT through the winter to see how it holds up, even though I'm very lured by Klasse, Zaino, Duragloss....
Like many I think, I'm looking for the holy grail of polymer finish products - the armor coating with blinding shine that lasts and lasts.