I use invisible thread in my longarm a lot, mostly Monopoly by superior but I have also used Filtec Essence which is a nylon monofilament. I looked up the sulky and it sounds the same as monopoly, a polyester monofilament, .004" which is equivalent to 100 wt thread, super fine. I use it to SITD around applique and piecing, if you slip out of the ditch it is not noticeable. If I do a faux flange binding I use it stitch the binding down on the front. I have never used it for all over quilting but many do. I have never had any trouble with breakage but I do run much looser tension whenever I run monofilament thread in both my domestic and my longarm.