Well, good advice here, but I use emb. thread for quilting on my machine, either polyester or rayon when I want the sheen, especially on Christmas stuff. Need a 90 needle, and slower speed on the pedal and hands. If the thread of any kind breaks, I just back tack and carry on. Oh, do you make sure you pull your bobbin thread up when you begin? I don't know why, but it seems to help.