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As someone who spent a few years restoring cars (Mainly old Mercedes and Porsche) undercoating SEEMS like a good idea but it its not done at the factory as soon as the car is finished you are sealing in dirt and moisture that will cause more problems than its worth.
In theory its a great idea as it is designed to seal the underside of the car from the damages of sale and dirt. It does do this for the most part but where it fails is that it is done on a car that is not clean. No mater how hard you try, if its not done at the factory, it will have dirt and moisture on the underside of the car. When you seal that in there you basicly make a sand paper like material. When that has a few years to rub through the surface on the underside of the car and the sealed in moisture eats away at the metal you get rust. Most people will not notice it because you cant see it but its there.
I used to think it was a great idea until working on cars with undercoating and seeing what happens to the car after years of having it on I have changed to simply washing the underside of the car every month or two with a good pressure washer and a foam lance to get some cleaning power under there.
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