what is the stuff for the undercoating for your car? i can not remeber what it is called, it starts with a Z is all i know. i know this is a pretty vague description but any if anybody knows what im talking about would be a lot of help. im going to germany in october and i guess they use a ton of salt on the roads and i dont want the undercarrage to rot out on me while im there. thanks in advance for your help.