I just got this rubber coating from 3m through http://www.automatcentral.com/rubber-coating-spray.html. I was a little skeptical that it would be the next plastidip, I thought wrong.
after 1 coat
So when I was using it the can was very high pressured which I liked. I put 2 coats on the front and back bumpers and only used about 3/4 of a can. The only thing was when I was spraying it, it stunk, leading me to question if it is worth it to use it to soundproof your car. However, I am planning on using it to sound proof the metal around the sub box I am eventually going to get. Overall I am very pleased with the product and would recommend it to my friends.