I see you already ordered the SS stuff. I'm about to do my entire truck cab but I'm using an alternative product.
A company called Noico makes it and it's much much cheaper than Second Skin. Lots of people seem to love it.
A 50 sq ft pack is only 65 bucks. It's just a TAD thicker than Damplifier but I'm sure Damplifier is a better product. I plan on doing the truck better than the car as I'm doing a foam layer and MLV layer as well so I think going with a cheaper CLD will be okay. That and I need about 100 sq ft to do the trick so that adds up since it'll be three layers.