I got a couple cans of that, and the 12" squares, too. They are pretty reasonable compared to Dynamat

So in other words use the sheets everywhere you can. If you have to, spray the foam in the corners to make sure everything is covered.The can does not lay on nearly as thick. I used it to coat the back corner of the Tahoe where the sub is. I would recommend the sheets.
The farther away from the engine the better the chance is of it sticking. You'd need to get any and all rust/dirt off.Could I use JB weld to fill the small gap that's causing my exhaust leak? If not, what else could I use? I'm thinking that since I'm getting LT's, that part of the pipe will be cut off so I'm trying to find a temporary solution that will hold me over until I get LT's