Here's my first hand experience.....
It works as advertised. I bought 3 cans of the amber spray stuff and a quart of the non-aresol stuff. It's better than zibert stuff. It will run and seep into edges, metal folds and cracks. It also self heal pretty well when scratched. I run a bead down all the metal seams before the winter season.
I put also put it on, my RE disconnects, springs, hitches, frame rails, underneath the cargo area, wheel wells, under the floor boards, on top of the floors inside the cab, all bolts and holes that I see when taking something apart, leaf spring mounts, inside doors, hinges after I oil them, drip rail seams, and other stuff I can't think of....