Originally Posted by
sewvicki
I like the poly monofilament thread because you can iron over it (if need be). The nylon melts if you iron it.
My YLI nylon monofilament does not melt when ironed. I've used it in my invisible machine applique for years and never had a problem. When I read on the Superior website that it has a lower melting point than polyester, I took several strands of the nylon and ironed over them with my Rowenta on its hottest setting. It didn't matter how long I let the iron sit on the strands or how many times I ironed back and forth -- I could not detect any change at all in the thread. It certainly did not melt.