I use invisible thread. I got it from my local "Michael's" craft store. It actually comes in 2 different colors, clear and dark grey. This stuff is real thin and I've used it for both 1/48th and 1/32nd scale aircraft. I've also used 4lb. monofilament fishing line. I wouldn't recommend using thread, it gets fuzzy and the thickness is way off. Also, it collects dust and looks real bad after time. You can also use the "stretched sprue" method of heating over an open flame a piece of the plastic trees the kit parts come on and stretch it once it's heated. I think you'll get better results this way. You can also paint these items. I like to use a Metalizer paint because it's thin in consistency and doesn't clump up on the finished wires.