I have done the Krown on my car since I bought it. No rust (98 SVT Contour) Winter driven. Now I do take care of it. Also, on my old tempo it was starting to rust along the trunk line which was the norm with those cars. I never did any kind of rust protection on that but I did go an buy rust check and used it a few times a year on the area that was rusting. It never got any worse. Plus on the GrandAm usually twice a year I did the same thing with the rust check and again not rust in those areas. It did rust in other areas but not where i used that stuff. But the rust check helped slow down the rust that was there. I think its a good idea but I would recommend Krown. It seems to be the better one that I have found.
