It doesnt reduce road noise. It lowers the resonant frequency of a panel. Mass Loaded Vinyl reduces road noise.Which reduces road noise, which is what a great many people use it for. I used it specifically for that purpose in my old truck and achieved good results to that end.
I'm afraid not. As I said, there is a point of diminishing returns. With everything. So how do we know where that is? I've yet to see any testing which proves anything on that subject. In short, they can just slap any old thickness on there and tell us its better cause its thicker. I'd just like to see the proof to back up their claims, is all. They don't seem to want to provide any which is likely an indicator. Now if its the best, then its the best and I'll gladly buy it. I just don't really want to be wasting my money on deadeners that are overpriced when in reality you can buy the one that's cheaper and get the same results. Do you personally have any experience with all of these? Have you heard differences in them? I've noticed that Second Skin can't stop advertising to save its life, they're practically everywhere. That doesn't make them the best, necessarily.