The problem is that 80/20 batt is easier to FMQ on a domestic machine. It's low loft makes it stable and clings nicely to the layers but doesn't really give high definition to the FMQ. I have tried using 505 spray basting and polyester and that did not go well for me. Some do use 2 layers of batt but that is harder to stuff through a domestic machine and it can shift. I love the look of 2 batts that the long arm quilters post but I have accepted that I can't do it on my domestic.