In the past, I always used a dual purpose thread to piece and quilt with; at times, I would use a cotton thread but of a cheaper variety. I had on hand some Coats and Clark 100% quilting thread and began quilting. Not going to happen! My Juki TL 98 Q did not like this thread at all! The tension was way off and I kept breaking the thread. I tried, multiple times, to dial in the tension to no avail.
I did a search at Quilting Board and discovered threads that were foreign to me. I found a great quilt store close to me and they carry Aurifil and Mettler. I used the Mettler to quilt and I will use the Aurifil to piece the next quilt. Both are 50/2 in weight and ply. After ripping out all the stitches and the mess of lint that the Coats and Clark made, I started quilting. What a difference a better quality thread will make!