Has anyone heard of and/or have any experience with a product called Boom Mat? It's a spray in sound deadening material. Here's a link to the website: http://www.designengineering.com/category/catalog/boom-mat-acoustical-products/boom-mat-spray

Probably just spray can undercoating. If you want to use undercoating for sound deadening you need something with more body than what can come from an aerosol can. You need to use 3M Body Schutz, and put it on thick.

Alternatively, I use a product called eDead 80 from Elemental Designs. It's 80 mil thick aluminum foil backed butyl rubber, cheaper than Dynamat, and just as good. I did a lot of research on various paint/pour systems and foil backed variety and chose eDead.

Ok, so I was watching Power Block and just saw them showcase another product I wanted to ask you guys about, Lizzard Skin.

http://www.lizardskin.com/

Alternatively, I use a product called eDead 80 from Elemental Designs. It's 80 mil thick aluminum foil backed butyl rubber, cheaper than Dynamat, and just as good. I did a lot of research on various paint/pour systems and foil backed variety and chose eDead.

I bought edead as well after reading a series of test on several sound deadeners. It came in 2nd and was much cheaper than Dynamat. I picked up to rolls, 60 sq/ ft for $70.00 shipped on Ebay.