Can you share the ceramic spray you used and where you found it?
Thinking of an upgrade...
sure thing, it is called Lizard Skin, which i found out is made in my home town of Houston.
http://www.lizardskin.com/ there is a "find dealer" link on their page.
i can defintely notice a great sound reduction inside the van, and the temperature inside stays fairly constant, it can get warm inside, but much cooler than it was without.
Today i finished up replacing some body bolts that were stuck and got the BedRug installed on top, and Wow, it is quiet inside now, with the van idling (6.0 diesel, no cat and 4" downpipe back) laying on the floor of the van, i can barely hear the exhaust.
The only thing with lizard skin is that it must be covered with carpet/vynil/wood/bedliner as it will wear through if walked on and such.
Progress from today.
My dad is building all the door panels while i am at school or at work, and he is going to be wrapping up the last rear door panel tomorrow so it is slowly coming together now.
with my stereo, i have 5 1/4" components which are 2ohm speakers and the amp is pushing 100w to each, holy smokes, they are super crisp and clear, and get very loud, every guitar note and vocals are clearly audible at 75yards away.