I often piece my batting, especially for smaller projects. I used to zigzag the edges together...until I discovered spray basting. Now I merely lay out my pieces and spray baste both sides. I used a combination of decorative stitches and FMQ'ing and haven't had any problems at all with the finished piece. Found a great rolling storage piece from Ikea with shelf dividers. I went thru all my pieces, rolled them up and sorted according to size. It has helped me to use the smaller pieces since they are accessible. I really hate to cut up big pieces of batting.