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

Very heavy, thick material. I used it to line the engine bay of my twin engine jet ski. I made the mistake of putting it on outside on a hot sunny day. The butyl and glue became soft and sticky, making it difficult to trim without sticking to the knife and my hands. On the plus side, due to the heat, adhesion was phenomenal. On the seller's recommendation, I covered a S'mart Favorite 90 with a S'mart RED 150. As far as noise reduction goes, it seems to work well and I noticed a noticeable improvement over the original foam liner that I removed.