I just sprayed a quilt together this morning :D
It was super easy, well relative to pinning, anyway. I taped the backing to my wall which was the hardest part of the whole process, since I wanted it nice and tight and straight! Then I folded the batting in half, took it outside and sprayed the upper half; stuck that to the backing; taped the bottom half up so the underside was exposed, sprayed it and stuck it down. Then I just sprayed the entire batting and stuck on my front. It's nice and smooth and stuck tightly. I've been rolling, stuffing and shoving it around all day and it's still nice and snug. No needle gum, either.
The quilt is 55x75, so a fair size; and the spray is 505.
This is the second quilt I've done from this can, and there's still a good shaking left inside but I won't start a third without another can on hand.