Originally Posted by ckcowl

lots of quilters use poly threads. i use poly, cotton, silk and wool and rayon threads. what ever my project needs is what it gets. the thread that has the color or properties i need. I seldom use cotton thread for machine quilting, it breaks too much, works fine for me for hand work, piecing and quilting. but in long-arm machines polyester is used most often, because of the speed of the machines, it does not break like cotton thread.
the size...40-50 wt is the norm for piecing, the higher the number the finer the thread. most regular sewing thread is about 40 wt...my silk threads are 100 wt...very fine but very strong. i have some 12 wt. verigated my nephew ordered one time by mistake...boy it is thick!