thats not burned, thats just aging. its just aging faster that the other two due to where its being stored.
solvex perf is junk and isnt rated for more than 6 months i dont think.
Solvex window perf rated 1 year outdoor. It turns to brownish on unprinted surface.
Jim, over with white vinyl lasts longer, but if clients want to be able to see out, then perf it is.
If it were sunburned.... wouldn't it be kinda evenly ??