I found this thread that might be helpful:
http://www.thequiltshow.com/bb3/view...p?f=110&t=5578
Personally, I wouldn't want the extra drag on the needle that spray basting would produce. In your situation, I would probably opt to thread baste with boards the Sharon Schamber way (she has Youtube videos that show how to do it). If I could afford it, I'd probably ask a longarmer to machine baste the quilt with water soluble thread. (You just have to be careful not to sweat too much as you work!
)