Look at this article I found. The paint finish rebonds its self after a scratch with the sunlight. Pretty cool.
For more info, here's the link:http://tech.yahoo.com/news/nm/20090313/tc_nm/us_plastic_coating
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That is very interesting. It could have many applications other than vehicles too.
As an aside, I have titanium framed glasses that you can bend in any way you want and they just go back to the original shape. So how about a Jeep made out of that titanium and then painted with that self repairing paint. It would just repair itself.......No worries on the trail driving through the bushes in your Jeep........
Dave