Yeah, I REALLY try to do as much as I can by machine, but generally it's a lot easier for me to get thin, uniform SG coverage by hand. I've done it by PC quite a few times, and there's always some place where I have to use a little QD to get it off (not a big deal, really). I'm gradually giving up on the PC application, even did the MPV by hand last time. If you have shoulder problems, that's different. I don't think the Pep Boys buffer would work out very well.