Nanna-up-north said " I try to stay away from 100% poly because the thread is so much stronger than the fabric and I've heard that it can cut the fabric over time. I've seen that happen on really old quilts that got used and washed a lot." This statement kinda puzzled me cause I didn't think poly thread had been around for a terribly long time? Maybe it was the fabric dyes that weakened the fabric? Or stitches were too tight or needle too large? Does anyone know what could make that happen? I've done applique w/poly thread because it is strong, but I'd hate to have my quilts someday start to deteriorate because of it.