I thought you were supposed to use cotton thread so it would shrink with the fabric. Is that incorrect? I have a longarm that I bought used a couple of years ago and am just getting the nerve to put a real quilt on. While practicing, I have been frustrated with tension and thread breakage. After reading the review listed above, I am considering ordering a sample to try. I would appreciate clarification on the cotton vs polyester thread issue. I don't always pre wash fabric. When I do pre wash, it is all the fabric for a quilt or none of it so shrinks uniformly......theoretically.