rzath - Last fall, i had only DG501 and Collinite 845 on hand... I applied the 501 and a few hours later applied 845 (at the time i did not know about cure-times and all that jazz)... My pickup truck was brand new, and i drove it A LOT... Lots of road grime and lots of touchless washes... When spring time came, my truck was still beading, to the point where i'd drive out of my housing complex and make a sharp turn and all the water would roll off the roof and hood. I noticed a little less beading on the rockers and doors (where most of the road spray occurs...
I think 501 is very durable, and with that said... this fall i applied 601/501... 601/105... 845.... and one week later some Aqu-wax.... I'm thinking i'll need multiple washes with Dawn in the spring to remove the wax! I will always be a DG guy :xyxthumbs:
to answer your last question, i applied DG by hand, using a Polish'n Pal with LC White pads and the 845 with LC red pad.