Ok I am building a fiberglass box for my car and I was curious about using rope that has ben soaked in fiberglass for support. From what I gathered from
http://audioforum.termpro.com/cgi-bin/ubb/ultimatebb.cgi?ubb=get_topic;f=32;t=000549
You use nylon 3/8" to ½" rope, soak it, lay it down...