Welcome to the board!
I just used the 505 spray for the first time. I'm totally impressed with it and it sure does beat the heck out of all that pinning! (now what to do with all those pins!?) I don't care WHAT it costs, I'll be buying it again!
I sprayed the batting VERY lightly, not even completely, and smoothed the backing fabric onto it, flipped it, smoothed the batting, flipped it back and made sure all was smooth. I then sprayed the batting top, added the quilt top and smoothed it flat. I went to work on the quilt almost immediately! No sticky needle, no other problems, other than my arm stuck to one spot of the batting while working on it. lol (It peeled right off! lol) Two days later, I worked on the quilt again and had to pull the top back slightly to cut the batting edges. When I smoothed the top back in place it stayed where I put it, so, I'd have to give this stuff a big fat TEN!