Kim, lay the back on floor and use painters tape to hold tight, then batting and top. Do you pin? I did not have luck with pinning but would use white thread and very large basing stitch to sew together. Or take my back out side and spray with basting spray (very lightly) and then lay on floor. Then repeat with the batting(lightly spray top) and repeat with top. There seemed to be a lot of back and forth with the spray and outside, but it worked and no sticky in the house. Some battings help to hold the back flat better than others exp. 80/20 & W&N. Poly is harder to work with except on the smaller quilts.