I usually zigzag but I'm not too keen on the puckering and frilling of the batting. Tonight I had to join pieces of batting for a quilt that is being raffled to raise funds for a community school in Zambia. I really want the quilt to have as good a finish as I can accomplish so to make it as smooth as possible I got out some webbing I'd had lying around for ages. I ran it along the back and front of he batting and really pleased with the smooth consistent finish. Wish I'd used this method before now.