I've used the cotton covered poly thread for years, both for quilting and general sewing, home dec, etc. I have often put my iron as hot as it can get and have never experienced the thread melting. The only thread that I'm aware of that melts is the old monofilaments.

here's a great video by superior thread on this subject

http://www.superiorthreads.com/video...yester-thread/

fabric_fancy-thanks for that thread video-very interesting.

We had a "Threadologist" come to our guild last year and speak on this.

I hope my quilts wear out from love and use before I have to worry about them being old and damaged from thread.

the entire series on thread is excellent

here's a link to the main video page in case you'd like to watch some other videos

http://www.superiorthreads.com/videos/

ditto

What a great sight. I have just played all their videos over the last hour or so. I am so glad they have distributors in Australia. Thanks for this link.

I use the Mettler polyester mainly because we only have one fabric store in town and that's what she sells and what's convenient. I am considering placing an order for the Connecting Thread's thread essential because it is a great price.

Usually I only use Mettler cotton because that is what LQS has and I really like it - but the polyester came with the machine and I was worried that it wouldn't be as strong - but looks like I have nothing to worry about. Thanks everyone.