I have A LOT of thread. I use it, going thru a couple spools each week. I have 2 sergers and 11 machines. I machine embroidery and quilt my own quilts. All of thats takes many spools to complete. What I do is, use silicone to help old thread in the machine. When doing high speed sewing commercial sewing they place their thread in buckets of silicone lubricant while sewing. If that doesn't help I put it on the sergers. That uses it up quite.