I found cracks in the skylight and in the ceiling fan covers and lids and then while I was up there I noticed that the attic vent cover was broken and so I replaced the attic vent too. Then a friend asked me how my boat was holding up and I told him that I noticed some delamination of the plastic on the 12 gallon fuel tank. When I showed him he noticed that it had a hole clear through on one corner. So I ordered a new fuel tank just a different brand. I am learning that if you don't want plastic to break down under UV rays then it has to be covered.