When I first started quilting I was told that serger thread was fine for piecing and quilting. Boy was that person wrong. I made a king-size quilt for my bed that developed lots of toe catchers from the popped quilting stitches. Serger threads are designed to be used with more than one thread at a time. They are not strong on their own. Superior Threads, Aurifil, YLI, and others have good quilting thread. Visit their websites. Buy the best quilting thread that you can.