Really don't want to sound like a know-it-all but I have spray basted over 100 quilts and have learned some tricks. I put down a big flannel sheet on my king size bed then spread the batting on that. Next I arrange the backing on the batting, pull back half the backing, spray, and smooth backing back. Makes no difference if you spray the backing or the batting, same results. Repeat for second half. Flip project over, arrange quilt top on batting, and follow the same procedure. I mostly use the June Taylor and purchase it from Joann's with a 40% off coupon. Have never had a gummed up needle and the layers stay together nicely for a LOOOONG time.