taxreliever
Licensed to Represent!
I would disagree on the professional end. When I first bought my truck in high school I had to take it through to winters, the undercoating protected it quite well by holding the few bits of rust on the underside in place. I now use a spray on heavy duty metal protector from AIMSOIL (shout out to Chris!) that has been great as well holding everything in place.
I use tons of that stuff on my DD's each year......getting ready actually to bring in the King Ranch and Expi to do it's annual spray of Amsoil HDMP!
What I love about that stuff is, it sprays on like a liquid to drip into all the cracks and crevices that the liquid salt stuff can splash into, then a few second after, it hardens into the water repellant wax like substance.....pretty amazing stuff.