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I use bungee cords to the tarp grommets - rain never gets through. Only watch out is for heavy snow but still doesn***8217;t push through.
Downside is the tarp lasts 1 year max

Thanks but to me keeping water out is 1/2 the purpose of cover.....the other is sun protection.
I cover my boat after each use so having to fuss with two covers would be a hassle.