I was just checking the underneath of my car for damaged insulation. I usually clean it, treat it with phosphoric acid, por-15 then spray rubberized rockerguard. I am starting to dislike rubberized rockerguard because it does not adhere that well. When it bubbles it creates perfect saltwater pockets. Oil based products seem to be a bit too thin and tend to wash away. The PJ-1 o-ring lube(motorcycle chain lube) is sticky as hell and it does not wash away easily. Any one have any experience with it as a rust inhibitor?