I was kind of leery of the Krown job done on my truck last fall. It seemed like they skimped on the application. But now that it's spring time and we've had some warm days, I can see the products creeping out from body panels, etc. Underside looks really rust free, as you'd hope on a 2017 Ram. Good thing about oil based products like Krown is, sure you're going to get dirty when you have to do work under the truck, but it's going to make bolts, etc, come off easier.
My father in law on the other hand got suckered into a $600 Ziebart job on his spotless 2017 Nissan Frontier (currently 8K miles on it)
The underside is caked with that roofing tar like stuff in those nightmare youtube videos. I told him not to, but he had it done anyway.