Just my opinion, but 3M's Machine Glaze (for dark cars) does a mighty fine jop with a DA (PC?) and a finishing pad

& if followed up with 3M's Imperial Hand Glaze, although a lil' more costly than Megs, is a lot more user friendly yeilding better results. Also, it's my opinion that it's either wax, or glaze not both -- the final finish tends to look a lil' oiley or streaky when they are combined.
As for the glaze -- the night before, yes; the day of, yes; two days before, yes. The more lite layers the better. Spread a little bit out with a soft towel (diaper, MF, whatever is your prefrence) then before it fully dries buff it off with another. Overlap sections, do the whole Mach 1 as if it was a fine woman (or man - don't ask don't tell) you were joyfully massaging. Follow up each session with a MF lightly misted with Megs Final inspection (#34). Post pictures along the way