I found another use for invisible thread. When our Guild held a quilt show, we had to put hanging sleeves on our quilts. I was very very nervous about using safety pins to hold up a king sized quilt with a 4 inch wide sleeve. Instead, I put invisible thread in my bobbin and raised my stitch length to its longest. I sewed the hanging sleeves to the quilts, no one could see the stitching from the front, and I knew that the quilts would be secure when they were hung up. Taking the sleeves off after the show was a breeze because of the big stitch length.