Mine isn't running yet but used lizard skin. It's light, easy to apply and you can get 100% coverage. Water shouldn't be able to get under it as you paint it on. Can also put many coats and do both sides. When you knock on the panels it's much quieter than before. My friends is running and he has been doing 1 area at a time, just brushing it on, and it gets quieter with each section done. I used fatmat on my last car. It's a cheaper dynamat type of stuff. It weighed a ton, and was hard to cover weird shaped areas. Anything is better than nothing though. Also if you get carpet the mass backing is supposed to make a big difference.