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I actually kind of prefer the pink insulation foam you can get at home depot simply because it's cheap and very structurally sound so you don't have to worry about flapping in the wind and what not. The only down side is that, unless you stack multiple on top of each other and shave to appropriate curvature, it's going to be flat, and remain that way. The good news is, is that they come in big sheets and to cover holes you don't need much so one sheet usually does the trick.
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