Cathy, rayon thread does have uses. For sheen and shine, it's a great thread. I wouldn't hesitate using it on items not worn and washed frequently. Like on wedding dresses, specialty garments etc. I sure wouldn't use it for FMQ quilting (strength issues) or in areas of wear. I still have a bunch of it I'm trying to use up. Right now, I'm using it for raw edge applique on areas of quilts that are mainly wall hangings and the occasional t-shirt embroidery. And that is fine... really it depends on the use. But, for me it's much easier just to have poly embroidery thread so I don't have to put too much thought into every project. Just my opinion of course!