gaigai

I mistyped, it is .004 (I checked the spool) and yes you can put it in the dryer. I don't have anything in my house that doesn't go in the washer and dryer including silk, bra's etc. I have both poly & nylon.

The thread is not stiff or hard, and so far I haven't had any breaks or toenail hangers. But I've only washed my quilts a dozen or so times, so time will tell. My quilt expert, who has been quilting professionally for over 30 years uses it almost exclusively. And she says (I just phoned her) that you can use it in your bobbin too. In fact, she is now living in BFE, and she wants me to go to one of the wholesale drapery companies and buy her a HUGE 2 pound cone of it before I come visit her next month for a quilt lock-in weekend.

MadQuilter

I did one quilt with a nylon thread a long time ago and it held up under heavy use and many washings and dryings. Since then I decided that I wanted to see my quilting stitches and use regular thread.

Ducky

I occasionally use .004 nylon for the quilt top I guess because I didn't want the top thread to show. You know, I have never used it in my bobbin because I wasn't sure if I could or not. I just learned another new thing here...

amma

I have used the black nylon on some sweatshirts...didn't use it in the bobbin, I used regular thread. These sweatshirts have been washed and dried a lot and are still fine...

BellaBoo

Nylon invisible thread will stretch and can cause breakage problems. Poly is much stronger and will not stretch. I was told never to use the invisible thread in any baby or young child's quilt. I mostly use it in the bobbin and quilt on the back side of the quilt with matching thread for the back.