If you use polyester batting, be careful about using an iron anywhere on the quilt itself. The last quilt I finished, I decided to iron around the edges before I started sewing the binding on, thinking the binding would go on more neatly and easily. The batting sort of squashed down into a matted solid strip about 4 inches around the edges where I had ironed. I felt sick when I saw it. I had to take out some of the quilting, trim the matted batting off, and sew replacement batting in its place. That really ruined my day! I said, "Thank You, God," a bunch of times that it all looked fine after I finished the mending job.