I will also be using POR-15 on my undercarriage, but have been putting it off until the end of the summer just cause the heat makes me lazy. But either way this is what I bought:
http://cgi.ebay.com/ebaymotors/ws/eB...EF:MOTORS:1123
But according to the research I've done it's quite a task. I will post my results once I do it.