While my Rubi-X is still clean and rust free underneath I have been wondering what others do, if anything, for undercoating. LineX, POR-15, PlastiDip, something else? I'm having some armor and suspension added and can coat that off the Jeep - but what works best for everything else to prevent rust, look good and potentially deaden sound? What was a real pain to put on? What actually held water between the coating and metal and promoted rust? What just didn't hold up? Any information on your experienced would be appreciated.