Quote Originally Posted by VXJimD View Post
The crusty lookin' areas were simply areas that had not been sanded enough to remove the factory coating.

If you have crust, it is the factory coating degrading and you need to remove that coating, generally in its entirety.
"Crusty" really wasn't the word I should have used - "milky-looking" is much more accurate. Anyway, I'm positive you are right and it was the final bit of the factory coating. Once it was entirely gone, it looked awesome!