butyl-based and easy to apply. The Kilmat was significantly less expensive. Stay away from anything asphalt-based. In the hatch area and on the bulkhead behind the seats, I used Dynamat, then covered that with a second layer of Noico Green 170 mil, a very light weight self adhesive closed cell foam 1/6". It absorbs sound, but was used more for its heat insulation value; and to clean up the appearance of the randomly cut Dynamite pieces. https://noico.info/products/noico-green-170-mil-36-sqft-?ar-waterproof-sound-insulation/
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