My very first glass and epoxy job was a Hal DeBolt Caudron 1/4 midget (all wood). It was painted with automotive acrylic lacquer. The rules stated minimum weight was 2 1/2 pounds. I had to use a 500Mah battery to make weight when everybody else was using 250 packs. IIRC the epoxy was "Safe T Poxy" and i think I got it from Aircraft Spruce & Specialty.

So ever since I have always held the belief if done right glass and epoxy can be as light as plastic cote. You just have to pay attention to the amount of paint and epoxy you use.

Ken