The Dritz is ok, but I liked the June Tailor better. I haven't tried any other brands; I get what I can with a coupon at Joann's.
I spray it in a grid, probably 4-6 inches apart. Not too heavy. Spray the batting, not the fabric (at least that's what I was told). I fold the fabric 1/2 way back, spray a foot or so, smooth the fabric over it and continue until that 1/2 is done. Then I do the same on the other side. No need to wait between spraying and smoothing the fabric over it. After some handling on the machine, I sometimes re-spray the edges if it needs it. It holds pretty well...at least a few weeks in my experience.
It's so much faster than hand basting. And it's easier on my back because I'm spending less time hunched over it.
Good luck! :)
EDIT: Other brands may suggest to wait before spreading the fabric over it. I don't think it mentioned it on either one I've used. The print is so small, I only skim over the instructions. :)