POR15, undercoat, or sprayon bedliner?

This discussion is exactly why I spent two years looking for a rust free car from out west. I found the Dart in Reno and it had spent it's entire life in Nevada and SOCAL and also had a good factory undercoat which has gone a long way in preserving the car.

I had previously restored a Duster that spent it's life in the southeast and had rust. I made heavy use of POR on the areas that had rust. Those surface areas that I took back to bare, non rusted metal held up well. The areas that I didn't want to have to cut out and replace I went down to the bare metal as best as I could and slapped on the POR.I now know that I should not have taken it down to bare metal but painted right over the rust. I will say that it is very nasty to work and anything it touches you might as well plan on throwing away. Sure enough about 5 years later the rust was back. Part of it could be that I live in FL in Lake county FL which has fairly heavy rainfall and the car was not garaged or kept dry.

If you don't drive your car in the rain and keep it in a climate controlled garage or shop you probably have a far better chance of products like POR holding up for a lot longer than they did for me. I havent had any experience with the RHINO product but will say that a neighbor did his pick up bed with it, it's about a 1/4 inch thick and it is holding up very well after 8 years.

Right now the Dart is a fair weather car only and stays in the garage with a good cover on it. Ive spent so much money on it that I will probably wind up being buried in it. LOL