A bit off-topic but very interesting:
http://www.physorg.com/news184310039.html
"Spray-on liquid glass is transparent, non-toxic, and can protect virtually any surface against almost any damage from hazards such as water, UV radiation, dirt, heat, and bacterial infections. The coating is also flexible and breathable, which makes it suitable for use on an enormous array of products. "
sounds like a good idea.
Mac.