A hole in the Roof

[Dan R-M]

Hey all!
The brief story of our new yurt is on my blog, so I won't go into great detail about the back story. It's a second-hand Spirit Mountain Yurt, and was cheap for good reason (as anyone familiar with SMY will recognize).
We've got a large number of holes in the vinyl roof, most of them in one quarter. Some of them up to 12 inches long, some that are multiple smallish holes in about a half a square foot section.
I used a pool patching kit to hit the big holes before putting the roof up, but it didn't work completely. Then there are aaaaaall the other holes...
I'd welcome any creative ideas! Especially if you have reason to believe they work.