I can't remember where I read this, but someone said his blitz bumper paint was cracking all over the place... Is this because he used regular paint on his bumper?? I heard that there is a special type of paint you have to get for your bumper because your bumper flexes. Regular paint cracks when the surface flexes?? I sanded my friend's bumper down with him after he realized that he got the wrong kind of paint... Am I correct?