I use 505 and really like it.I get it from Sew-for-less in the large cans. It is not really cheap but cans seem to go a long way and is worth the money. Easier that pinning and also the quilt sandwich is not as heavy. Spray basting seems to hold better and the parts do not move since they are glued together. I use hobbs 80/20 batting and the spray works well on it. Acutally last time I sprayed the batting instead of the top since that was easier and and no problem with sandwich holding together.
Alos tere is no need to iron sandwich when spray basting.