Well, bought [CycleShell] in early 2011. After 5 years the UV destroyed it. Got a replacement cover in mid 2016, and tried to remember to treat it with UV protection a few times a year. Now in late 2022, UV has destroyed that one as well (gets thin and then tears). Apparently I didn't use enough UV protectant, the right kind, and/or often enough.
Vendor never replied to calls or Email. Then the website was taken down. So R.I.P. Cycle Shell.
My small tear was caught by the wind and turned into a several foot vertical tear (the entire panel) and then horizontally several inches across the bottom. Bought some grey, synthetic tarp-like material at Walmart, and some 3M 90 "Hi-Strength Contact Adhesive Spray." Cut a piece of the tarp to cover the entire affected area with lots of overlap. Then sprayed it and the Cycle Shell with the adhesive. It comes out like silly-string. Several passes and then let it set up for a few minutes then attached it. Should have been a two-person job, since if it touches, it sticks.... but there are a few minutes of "pull off the wrong and re-stick" time.
Anyway, it looks better than I thought. I have no idea how it will hold up. Time will tell. Found another small tear on top and slapped a patch on that the same way. If this works, I could end up covering the whole thing in this stuff.