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I have never sealed it, but then I have not had it in heavy rain. If it becomes a problem, I will. Like you when I was looking at both tarps, everyone was recommending the 12. I have never seen a 9...

If this will be your only tarp, the 12 will give you more options. Yes, you could get by with the 9, in moderate weather. If you get a driving rain or high wind, there will be no way to close off...

I have the Noah 12 as well. Love the tarp. I bought it on sale and paid $50. Go with the 12, you'll be glad you did.