I wonder how long it will take before it starts fading out?
I doubt they're going to engineer a product like this and not think: "Oh my, shouldn't we maybe add some kind of UV inhibitor or use a base material that is inherently UV resistant?" Their main claim to fame is restoring plastic sundamaged trim/cladding. How long would a company last whose product fails to do what they advertise. Word of mouth is going to make or break them.

From the Gatorback website:

Q:What exactly do you mean by long-lasting?
A: Unlike any other treatments available until now, the GatorBack coating will not wear off, weather or fade. Obviously, reasonable care is required in keeping the plastic surfaces clean, and there are contaminants that will affect the appearance (exposure to acid rain, rail dust, fall-out). However, in general, this is truly a one-and-done product. There should be no need for further applications of any kind.
I'm confident it'll hold up.