I dont glass my planes for extra strength, but to prepair the surface for paint. With out doing it, the vibrations & stress from flight can cause the paint to crack if not glassed. Im not saying the glassing doesnt add strength, just that its not done for that reason. Alot of models can and are covered with iron on finishes in stead of glassing, so like i said, its generally done for surface prep. Another process is useing water based polycrilic. I just finished one this week with this process and like the results......Gene