In all fairness, you need to know that NO coating is "absolutely impervious" to the elements.
Every coating out there will eventually lose to mother nature, father time and the elements. No getting around it. But at At RotorLab we have been using a patented, proprietary ceramic-infused silver-oxide coating for over 8 years now. Our coating not only protects well against the elements and seems to last a lot longer (the set running on our cars is currently at almost 18 months, through heavy Pacific NW rains and still looks great), but also actually has heat-dissipating qualities due to the ceramic particles in the pre-applied emulsion. No other coating out there can make this claim. Its bright silver appearance also gives the wheel and brake area that nice "clean" look, and easily washes up with regular soap and water and a sponge when detailing your car.
Another RotorLab innovation that comes to your benefit.