It's not really a QD though, is it? It's much more a spray wax, regardless of how it's marketed. However, I found it difficult to get streak-free finish with it on the Z without a lot of work. I did find it easier going on harder paint, but even then I wasn't exactly blown away by the finish (compared to what was underneath it).
You seem to have got to grips with it a lot better than I have though, your Z looks great there.