For those of you who have done it before I have a question about what to use on door panels besides a layer of damping material. I need something that's closed-cell (not absorbing water) and it can't be too thick. Right now I found Overkill, Ensolite and Dynaliner, but dunno which to get. (ideally I want to put Luxury Liner pro but that stuff is too thick and make your door feel like it's filled with cement. LOL)