I'm gonna have to agree with BadCompany V.P WS6 on this one. Although I don't use Tropicare products on a regular basis, they do make quality products. Much better than that stuff packaged with a turtle on board.
I'm be more inclined to believe that the product froze while you had it, or you got a bad bottle and just never noticed what was happening with the red car. Black shows everything, and if there was a problem with the product, it wouldn't of shown up as much with the red paint vs the black, so the problem could have been missed with the red paint.
I've haven't tried the ICE products from Turtle wax yet. But given my past experiences with this company, I don't think it would give me the results I am constantly looking for.