I would discourage you from using nylon or polyester monofilament thread, as in my opinion there are better choices these days. I would opt for Superior's Bottom Line or MicroQuilter in a color to match the background. If you opt for monofilament, be sure to search the QB for tips on using it as it does require (at a minimum) reducing the upper tension on your machine. I also think a walking foot would be helpful if you are doing straight line quilting, such as rays.