The top foil of Damplifier products is very thick (6.5 mil) and is designed to be a very good primer type surface that most everything will adhere to. We designed it this way so there would be no issues applying other products on top of it. The epoxy isn't going to get through the foil onto the butyl so I see no concern there. We would recommend you try it out in one spot before putting it all over a large area. I think it will work just fine, please let us know how it works out so we can help future customers with the same question.