I'm horible... First, I use poly in a can not nything special in a sprayer or air gun. If its warm out i lean bow against the house with cardboard under the tip and against the wall. Spray belly, let dry for 2 hours, then carefully take it in to dry 24 hrs. repeat on the other side. Bad I know.
If its cold, I lay the bow back down across corner of work table in basement (use a mask) (covered work table of course) spay on, then leave and let dry, flip and repeat. So far this works out fairly well for me, but I KNOW that's not the best idea.. BUT, I never have a string or anything sticking to the bow, or covering anything that I have to spray over later etc...