It is my impression that photodegradation of polyethylene boats due to outdoor storage is much less a problem than it used to be a few decades ago. I remember polyethylene kayaks from back in the 1980s that would completely degrade with prolonged UV exposure and become useless. Boats made of cross-linked polyethylene seemed to be a bit more susceptible than those made of linear polyethylene.
I have seen polyethylene boats used by rental liveries that are stored outdoors year round. Although these wear out from the abuse that such boats can be expected to receive, they do not seem to photodegrade like those of the past used to do.
My understanding is that the light stabilizers added to modern polyethylene boats will themselves be broken down by very prolonged UV exposure, but I think it takes quite a few years of intense exposure before they are consumed.
Full Size Sail Rig
The Kayak Wing
Gedi Convertible Helmet
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