Try rolling the piece you are basting onto a 6' or 8' length of 1x4. You can get it rolled on with no wrinkles even if you have to use your floor. Then when you are spray basting only spray about 4" at a time across the width. Smooth that part down and then your are ready to spray another 4 inches , unwind, smooth, spray, unwind, smooth, spray, etc. until you have the whole quilt spray basted. I would practice on smaller pieces. Remember the spray will wash out so you can practice on bath towels or anything you want. It doesn't have to be quilting pieces to practice on.I've seen this demonstrated on TV - worked fine for them.