depends on which quick detailer I use. I use meg's quik detailer with claying the car and also as a general wipedown. If I'm strugglin to buff wax, I'll use it. Also use it on polishin pads to stop them drying out.
With Poorboy's QD+, it's a lot more oily and I think it has liquid carnauba in it. Anyway, I use this to treat the door shuts etc once I've cleaned them. I find it too oily (and hence messy) to use on the bodywork.
If you have previously detailed the car and given it two coats of wax, then the next time you wash and dry the car, you can buff the wax with the quick detailer to improve the shine, since I believe most if not all have some amount of wax in them.