I didn't know there was more than 1 available from Ford. Mine has made it through a non-tame Mid-western winter, with lots of salt and such.
Granted, I tried to hit the manual wash at least once a week to get all of that stuff off, maybe that is the problem.
Did you polish/wax it at all? I had a couple of coats of Zaino on mine and have since put 2 or 3 more on .