Have read that Coats and Clark threads tear and shred. Guttermans threads are suppose to be better. Look for thread that says hand quilting. Use it for just that. Don't put hand quilting thread in your machine if the thread is coated.
My fabric store told me it's ok to use hand quilting thread as long as it is not coated. I am going to try hand quilting myself. Not sure if I will enjoy it, but need something to do while in the chair or at the tv.