I don't know if you follow the project33 web site but her is Scotts new post on how he insulated the coupe.
http://www.project33.com/article.cfm?ID=810
I went to the company web site and they also have a roll-on thermal barrier.
http://www.cascadeaudio.com/
I looks like a good product and as I understand it, cheaper than Dynomat.
MikeC