I found this product browsing through a home improvement magazine today. It's from a company called Industrial Nanotech and it's called Nansulate. Here is their website:
http://www.industrial-nanotech.com/nansulate_home_protect.htm
The product started out as an insulative coating for pipes but it has moved into the home market. It goes on just like paint and comes in either white or translucent. you can also paint right over it and it's water based. The website says that with 3 coats it will provide a 60 degree temperature difference for the Homeprotect Clear Coat brand and 30 degrees for the Homeprotect Interior brand. It protects against all three kinds of heat transfer, conduction, convection, and radiation. Standard insulation only protects against conduction. It's also mold resistant.
It sounds really great but it's $65 a gallon and one gallon only covers 150 square feet(with the required 3 coats). To do all the exterior walls in our house would cost roughly $1200 to $1600, that doesn't include the floors or ceilings. That's not too bad a price but we've used up all the money in our construction loan so unfortunately we wont be buying it any time soon.
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