I'm not a friend of basting spray but I certainly use the large tables at the church hall. We use the painter's tape and tape the backing to the tables (we use 3 or 4) fairly tautly. Then we lay the batting on top, smooth and lightly pat it in place and then layer on the quilt top. We safety pin every 5-6 inches checking the back fairly frequently for folds or puckers and then machine quilt it. Our quilt guild has completed dozens of full size quilts using this method with a minimum of wrinkles on the back. Two or three of our members can pin a large quilt in about an hour if everything is pressed and ready to go.