We bought a new dingy last summer, Zodiac Zoom Aero 260. (Good little dingy, we're very happy with it, the oarlocks haven't broken, pretty tough, rides well with a 4 hp Yamaha.) However, after sitting in the sun for a total of seven months (three months last summer, four months this summer) the nylon webbing strap in the middle of the floor completely dissolved to pieces. It was as if I dipped it in sulfuric acid or something, just deteriorated to bits. FF is right, depending on the material it's shocking how U/V rays can destroy some things really quickly.
(I was never quite sure what that strap was for anyway so we don't miss it, but even so, we have a cover for the dingy now. Odd that Zodiac would use a material that so quickly dissolves under U/V rays.)