Yours is WAY better than my first quilt. I don't use the spray because of asthma, but it might be OK in a very well ventilated place. Like Quilting Crazie, I pin baste on a large table, or on several tables of the community center, all pushed together. Using painters' or masking tape hols the backing in place while you do the pinning. If you quilt everything else, but not the border, it will tend to be a bit wavy. As Jan said, without a LA to force everything to stay together, most poly battings tend to shift around. I use Thermore (c) batting which is very dense, thinner and tends to grab the cotton.