I don't know what the problem with your liner is, but I have seen a product online that addresses uv damage above the water line. I TOTALLY wish I could find the link...but I can't.
Essentially, the product is another piece of vinyl liner that is only about 12 inches wide...fits all the way around the top of your existing liner. It looks just like another vinyl liner border/area and it hangs just into the water (covers the vinyl exposed to the sun) I thought the brand was "love my liner" or something. I'm sorry I can't find the link.
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