Review on Top Choice: Smartmat 90 Mil Car Sound Deadener Material – Increased Audio Noise Insulation (30 Sqft) with Butyl Insulation & Enhanced Adhesion by Alejandro Labustin

I have used this material as the top layer of soundproofing in the engine cover on my twin engine jet ski. As recommended by the seller. I wore S'mart RED 150 over a base butyl S'mart Favorite 90 muffler. Favorite was quite heavy and dense, and I was surprised that RED was quite light, like heavy foam. I also found it to be a bit trucker when applied - once the plastic backing was removed from the adhesive it stuck to whatever it touched, so great care was needed to place it correctly before pressing it down. Overall, the two S'mart products definitely delivered higher noise levels compared to the eggcrate foam insulation originally installed by the shipbuilder.