A buddy of mine put that on his car and loves it. Hes had it on for 3 years and it still repels stuff. Seems like a good product, no flaking or anything. You can apply it your self but need to give the vehicle a good polishing first to remove any loose powder.
I haven't played with it yet, but been following it for a while. You can pick up cans of spray-on neverwet at home depot and Lowes for somewhere not far from the price of a regular can of spray paint.
From my understanding, if the surface you're coating is rough, it'll work well. Glossy surfaces not so much, as it can rub off easily.
Bottom of a truck oughta be a great candidate. Truck bed would probably be good, too. It'd be a little entertaining seeing a bunch of deer blood floating around back there.