I checked around online about that product Arachnid, saw mentions of it related to the chevy avalanche. Checked out some of the avalanche forums and found this mention..

"This comment comes realy late, but, I bought some stuff called Armor-dilla or something like that from the Chevy dealership parts dept and it is the OFFICIAL GM fix for discolored plastic on AVies. It says to use once a year. I put it on this weekend and it looks great. Better than it looked at the dealership eve."

If the Chevy dealerships are pushing it then it must be a pretty good product. And apparently the Avalanches suffer the exact some fading on their cladding as does ours. So, very interesting!