I have used nylon invisible thread for quilting. Never used it in the bobbin. I have probably given those quilts away, so I really don't know how well it has held up. I have never had any complaints. I had a problem with it getting hung up on some part of the machine and breaking because of that. I haven't used it for a long time. I do have a bunch of it. I have only made one wall hanging and used regular thread for it.