Wow! This is some really great information! Thanks everyone. I am certainly not affraid to use polyester thread now! Wish I had used poly when I quilted with white cotton, cuz I think the thread shrunk!

I'd never ever considered that poly thread would melt. I've used it a lot and never worried about it.

Now that special clear thread--not sure what that's made out of--that might melt.

I've not had any problems at all with using poly thread. Go for it!

The clear thread is sometimes nylon, which can melt under certain circumstances depending on the brand. I have used YLI nylon monofilament with absolutely no problems, but don't have a sample handy to test with an iron. My experience has been that there are only a couple of good brands of nylon clear thread, and YLI is one of them. Other brands have problems. A lot of people use polyester clear thread now instead of nylon monofilament, but I have found that the polyester is not as invisible as my YLI nylon monofilament.

Superiorthreads.com has tons of info about anything thread!

I use it all the time for piecing and hand quilting.
No problems.
I also use whatever it laying around the machine.

I piece and quilt with Gutermann Poly thread and never a problem here. Was actually recommended to me by my Janome dealer.

I use cotton wrapped polyester thread. No problems with ironing.

I use Poly thread to quilt and cotton to piced with just because I have some bubt when my cotton thread runs out going to all poly thread.

The special clear thread..yep, it does melt. At least the stuff I used. We used to call it "invisible thread." Yep, it sure was, especially after it met a hot iron! :hunf:

I have struggled with cotton thread breaking when FMQ with my Bernina 820 on my Bernina frame. With the information I have read here about Superior threads and a long arm quilting friend, I bought Omni thread which is poly thread. I have done one quilt with it. I had only one break and hardly any lint. I'm sold!