To see a great tutorial on spray basting, search:
Patsy Thompson you-tube on free motion quilting.
Sorry, I do not have the exact link to give you, but this will get you to a 4 part tutorial by acclaimed quilter Patsy Thompson. She uses a spray wall and makes it look ever so easy. FYI, she stresses that not all basting sprays are "created equal"; In other words, she uses ONLY the 505 brand and nothing else, since it has better hold and does not gum up your needle or your machine. It is pricey stuff (I paid $12.99/can at my LQS), but if it works as good as she says, it is worth every penny to me.