All three (brittle, faded, warped) can happen. Store your boats in
garage or covered and use a good protectant like 303.

We have a detailed article on storage and care of canoes (applies to
kayaks as well) at
http://paddledognation.com/LearningC...e-Storage.aspx

Happy paddling!
PaddleDog Bill

http://www.PaddleDogNation.com
Where paddlers connect!

wrote:
So seriously, a plastic boat left in the sun day after day, year after
year, and not treated with a protectant or covered with a tarp suffers
how badly from UV deterioration? The plastic gets brittle? Faded?
Warped? Or what?