I can personally vouch for the 3-m rubberized undercoating. I use it everyday at work. When we mount the rear end under the trailers all the steel has to be undercoated. That stuff last for ever to. I have seen trailers 10 plus years old and the undercoating still looks real good, and no rust issues what so ever. Couple years back some of the big wheels though they where going to save some money and switch to a cheaper brand after about 4 months of use we had some complaints up north of rust. So after saving a couple hundred bucks we had to pay out a couple grand for warranty work.
So my 2cents Dont step on a quarter to pick up a dime :mrgreen: