I was doing some searching and found the KBS Diamond Finish clear coat paint.

http://www.kbs-coatings.com/diamondf...clearcoat.html

According to the manufacturer, it's impervious to every solvent in the world, even acetone, it's temperature resistant to 500 degrees, it can be sprayed or brushed, and it's one part so there's nothing extra to buy. The price is right too at $34 a pint ($10 cheaper than Klass Kote). The manufacturer says it cures harder than most 2 part epoxy clears and remains flexible too. I asked them about applying over latex and they said that's a common use for it. Unless I'm missing something, this should be the end all product for clear coating our painted finishes. Unless I hear something negative about it, I think I'll be using it on my next project.