I finally got around to getting some SecondSkin Spectrum V.2 from Ant since it was such a good deal. I got 2 gallons for just under $100 shipped. According to Ant, 1 gallon is worth 40 sq ft of the Damplifier mat, so it costs approximately half of what the mat does with the same coverage/dampening.
After painting about 5-7 coats in my trunk, I'm pretty impressed with the Spectrum. It's quite thick, so it goes on very easily with a paintbrush with very little drippage/running. Just don't get too lazy, or it will run a bit, as you can see in the last picture in the spare tire well.
Let me know what you think and if you have any questions.
**EDIT** My stupid computer is still down, so here's a link to all the pictures. MANY thanks to Neo...