Undercoating
Corey, Of all the procedures for treating the undercarraige of a vehicle for rust prevention, I have researched this extensively and here is what I know. As you know, up here in Connecticut the salt pounding we get from the state is on a regular basis. Just ask ToolManTimTaylor a neighbor of mine. The worst substance used for winter conditions is in Pennsylvania. A coal ash by-product is spread on the road and is nasty stuff for metal and paint. Yes, the same stuff steam locomotives used in the forties. A good source led me to the oily spray that CAnderson mentioned. The only drawback is it eventually wears off. A re-application is required about every other year to assure complete coverage. All in all, if you clean the vehicle at least once a week and a pressure washer is ideal, also, hot water loosens up salty sandy build-up underneath, you can slow down the deterioration process that the environment does to a vehicle. I was also told that the standard undercoating in a can, the stuff that is gummey until it dries. That stuff dries and forms pockets next to the metal due to small levels of shrinkage. It can then crack and hold water that seeps in while running down the underside as you are driving and starts rusting. JY