I just edited my post - sorry, I had to go get the kids off the bus and felt it was a little abrupt! I tried spray basting once a few years ago on a bed quilt for my son, maybe it wasn't a good brand or I didn't put enough on, but it shifted all over the place! I am also a little worried about the chemicals in spray baste - maybe paranoia, but I wouldn't be happy using it on a bed quilt, especially for one of my kids. BTW I never gave him that quilt, no idea what happened to it, think it got lost in a move!
K x