I did one with the iron on interfacing under the seams as suggested. Because it was also made of poor fabric with small seams, I then did a zig zag with invisible thread over every seam. I realize that could ruin the value of a quilt, but it had no value except for sentimental value and it was the least noticeable way I could think of to hold it together. It has since lived to see another couple of years as a snuggle quilt.