I've used FluidFilm on my '11 since I bought new & have never known rust or cracked-bushing. It has a smell you won't forget- not necessarily bad but strong and unique like an animal shampoo or something - that makes you feel like you are in a barn or at a 4-H exhibit at the state fairgrounds but you will know no rust if you coat your underside with this awesome stuff.
I buy three cans a year off interwebz and both the JKUr and the '95 XJ have undersides fully slathered in it year round. Again, rustless and bushings look new on everything. Wipe it off if working on a particular part or area then reapply when finished. I have turned many peolple on to this and they, too, swear by it now. Try it..... super important to apply to a well cleaned whatever.
