Originally Posted by Jim's Gem
One thing that may help if you need to use the invisible thread again, sometimes it needs time to "relax" I have put it in a jar set off to the side of my sewing machine and then taped a safety pin on that side of the machine and thread the thread though the safety pin then thread normally. Sometimes the extra length gives it a little time to relax and sew a little better.
This is a technique that I learned in a class Harriet Hargrave gave to my quilt guild. I don't have her book in front of me but I believe it's covered in her "Heirloom Quilting" book. Also, use the Search feature at the top of the page to look for other threads on invisible thread. Good luck!