Ha, do you work for them or something? Either brainwashed or uneducated. It deadens some sure, but only while it is stuck on and what it does do it is not very effective at doing. Your opinion is wrong and not based on any scientific fact or understanding. Just because you think it works does not make it work. Per dollar it is not a good buy and therefore a waste of money.No i don't work for them man. I have used it and had higher numbers + deadening. I have looked at all the different deadeners and the normal FatMat is asphalt but the Rattle Trap is different. I honestly have used Peel and Seal, it all fell off of my doors. Used Fatmat Rattle Trap and nothing fell off. But everyone here is trying to say that Fatmat doesn't work but in reality is cheaper and it works just fine. Your opinion is wrong and not based on any scientific fact. The only thing i have read is that people have talked to other company's and been to the factory and they wouldn't buy it. It works just as good.What part of rubberized compound is NOT butyl don't you understand? Well someone said it's just a play with their words but still. How exactly do you know it's not? This really comes down to your definition of "deadener" and "works". The license plate test doesn't prove your point. Anything that's softer than the plate and the back of the mounting surface will solve that problem - 10 cents worth of CCF or even some chewed gum would be more effective and easier. Decoupling the surfaces is the key here, not vibration damping.Gaining SPL after applying the material is almost certainly the result of sealing air leaks. Again, many things will accomplish the same thing. That's really not "deadening" by any definition. It's possible that you got some panel stiffening in the process. That's an advantage asphalt has, since it isn't a vibration damper, you don't get the offsetting conversion of vibration to heat. You also don't get a reliably durable product that can be counted on to last for several years and may result in a serious mess. If you don't care about that and are happy to address the issues indirectly and inefficiently, I guess it could make sense. None of that supports the idea that it works as a deadener. Listen, to be honest. I am totally willing to be humble and agree with what your saying, both of you. The only problem i have is that all i am being told is that it does this, it doesn't do this. Just a he said vs he said. If you could get me some actual information and backed up science behind this, i will promptly apologize and then buy something else for myself! I am not trying to be ignorant, it would just be nice to have some facts. You know what i mean?