I think the better way to ask this is, has anyone ever had a butyl based product fail to stick to their roof in the hot sun? I would like to know too.
I know Dynamat is not the only game in town. I use Damplifier pro my self. I don't think it takes much to roll out some butyl and put some kind of tin foil on one side thus the reason for so many variants of the product.
At one time and maybe still today people were getting some roofing products cheap from the local building supply stores. I recall reading horror stories of this stuff failing and ruining headliners after they were installed. I don't recall any time reading about a butyl product doing that.
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