I use 476 by hand. Don't let it dry completely. Only do 1 panel at a time. Wax that panel, the hand buff that panel before moving on. When you have done all the panels, wipe down the car again.
Just applied a coat of 845 on my Regal, new to collinite, went on nice and easy and a little goes a long way, came off just as easy, nice shine, not worried about how long it will last as I too wax 3/4 times a years
Collinite 845 lasts at least 6 months, this has been my personal experience using it. The 476S is supposed to last even longer, in fact it says it will last at least a year right on the can. I tend to believe this based on how long the 845 lasts. I don't see how ANY spray-on liquid will out last this. I saw Nufinish mentioned earlier and I can say with certainty that it will not last as long as the 845, never mind the 476...