Originally Posted by
PatriceJ
first, i would recommend you switch to cotton thread for piecing, too.
i have read that rayon thread will not stand up as well to frequent washing.
some brands of poly are ok for piecing, but some could cause more wear and tear on cotton fabric.
(expect lots of backlash against that statement from devotees of poly thread. lol)
50wt is good cotton. 60wt is better, although usually more expensive.
I've used rayon thread for quilting in the past and it definitely won't stand up to repeated washings. I have a quilt I quilted with a variegated rayon thread that needs to be completely requilted. I used 50 wt Aurafil for piece and have been very happy with it. Using a finer thread has helped with my accuracy. There's less bulk in the seams.