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.
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