never iron any of mine if there not square i set a book on them for a day hugs
Great! I had wondered because I ironed a fabric that had polyester in it with my new iron and it melted on my iron. I didn't know that the fabric had poly in it nor did any of my other irons melt the fabric. The factory gave me a range of the highest temps that their iron could reach which made me crazy. I tested how hot my iron got and it was 340 degrees. So I started worrying about pot holders!!
I made some last year and the threads are fine. Enjoy your pot holders
I'd go ahead with the poly thread, just as you thought, keep the pretty side up. Be sure to use insulbrite inside and you won't have to worry about the hot pans burning through them.