I would guess that the prevention abilities are limited to just keeping water off of the metal. I did it to protect from rocks and debris. More than that though it just gives a nice contrast in colors. And it looks more industrial rather than just a black spray bomb or base/clear. Really "most" of it will not even be visible to the outside world. As the inner fenders cover much of iit.
The truckbed coating is imprgenated with lots of plastic chunks. Which gives it the textured appearence. I am going to do the remainder of the underbody eventually. I need to get the car road worthy in the next week or so.
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