Prism99

I've used a hot iron on polyester thread and it has never melted on me. I've also quilted with polyester thread (Glide), washed the quilt in hot water and dried in a hot laundromat dryer without any hint of melting. I do think that, for piecing, you want to test polyester thread with an iron before using it. Lately I have been using a 60wt polyester thread in the bobbin for piecing, but before using it I tried to melt some strands of it with my iron on its hottest setting and was not able to.

Glide is my favorite thread for quilting on my midarm frame setup. Before I got the frame, my thread of preference for quilting on my domestic machine was Aurifil 50wt 2-ply cotton. I think I would like Glide for my domestic machine also, but have had no occasion to try it. (Aurifil in both top and bobbin is still my all-time favorite thread for piecing.)

The biggest advantage I have seen to using polyester thread is that there is ***so*** much less lint than with cotton thread. Aurifil is the only cotton thread I have used that creates very little lint, but it's still a little more than polyester thread produces. Most poly threads have a little bit of shine to them (Glide does, anyway) and I like that; it brightens up the quilt in a very subtle way.