Originally Posted by
Onebyone
Seems to me thread made for serging is not as strong as piecing thread because you use three or more together in a serger so multiple threads made the seam strong.
Yes, you use three or four threads for serging but but one or two of those threads are straight, just as in regular sewing. Two threads make the loops and the others just hold the loops in place. If those straight threads break, all the loops fall apart. I don't see that happening. I use serger thread all the time.
Yes, it is two ply, but so are some other threads that are sold as sewing thread.