Good report to demonstrate some good products in the market will work.
In fact, I am a Professional Materials Engineer and can able to talk to coating materials experts around the world from Japan, Korea, UK, Germany, .... , etc.
http://hk.linkedin.com/pub/raymond-wan/64/88/904/" onclick="window.open(this.href);return false;
I will search those durable type such as Silicate, Ceramic, Silicone, etc .....
I may able to get some Free Samples from those related companies and tested in the laboratory over coated metal surface for abrasion resistance, UV resistance, hydrophobic properties, etc.
