Ultra Ever Dry

I don't know what your opinions are on rust prevention but this stuff has to be given some consideration:

http://www.youtube.com/watch?feature=player_embedded&v=IfUaKXasdD4

It's Ultra Ever Dry and from their clip it looks amazing! My car is currently in the bodyshop for a full strip down and paint and I was going to have the underside stone chipped. Now though, I'm tempted just to paint and have the entire underside, including the arches covered in this stuff

Any thoughts or opinions??

That looks amazing 'stuff', how long does it last and how expensive is it ? My concern on using it on the underside of your vehicle is that the car is not new, so how do you know you're not just creating a potential rust trap below this as by now you'll have rust behind seems etc

it's expensive and there is apparently a clear version coming out that could be used on paint

Wow very impressive stuff.  

Is it available only in the States?