I don't use this poly thread but I have used others. The only thing you can't do is iron the poly thread with your iron on the hottest setting. It will melt the thread if the iron is too hot or left on the thread too long. If you are using it for quilting, you should have no problems. In past years, it was said that the poly was so strong that the thread would eventually cut the quilt top because it wouldn't age as quickly as the cotton in the pieced quilt. I wouldn't worry about. Just go ahead and use it.