Originally Posted by DebbyT

You mention piecing and quilting. For piecing I use 40 wt. I recently went to a FMQ quilting class and for quilting she explained that she uses 100 wt. silk thread when quilting a tight/dense design. When quilting a less dense design, the 40-50 wt thread should be used. When the design is dense, if the thread is too thick, the detail is not as clear. She also explained that silk thread is very strong because the fibers are longer.

Originally Posted by DogHouseMom

I like using Mettler 60wt in the bobbin with Aurifil 50wt in the top, especially if I'm quilting with a lot of start/stops or heavy quilting/thread painting as you wont get thread blobs on the back. 50 Aurifil and 60 Mettler is a nice combination, they play well together.