If I recall, the FAA requirement was to bend it around a 1/4" mandrel, which is even above and beyond anything that you'd see in "real life" experience. I have folded Aerothane, LOTS of automotive paints, and AirTech back on itself, as well as the Stewarts. Newer Buty dope did pretty well...but old dope cracked easily. My results showed cracks on all but Stewarts.... like I've said before, I've got samples of Stewarts from '99 that you can STILL roll up in a ball and flatten back out and not have cracks. This is at room temps. (but like was said above... how many times is something that extreme going to happen in real life???) One thing I've found is that the failure rate goes up dramaticly with increased thickness of the topcoats....if you put anything on thick enough, it will crack.... and I'd guess if you try hard enough, you can get any system to crack at some point.
As far as water concerns.... I've also got samples of Stewarts that have gone through the wash (forgotten in my pocket) more than once, and they're just fine, and still pliable..... so in MY mind, that would pretty much squish any concerns of that nature.
I'm with you Steve, I'd love to see the other systems' results from being certified under the new regs. All the systems are good... you don't hear of failures unless someone trys to modify the procedures on their own or doesn't pay any attention to application... so with all the varying levels of competency that are applying these systems, I'd say that speaks pretty highly of ALL of them!
John