AlaskaKaz, Scottsdalerrc hit on what I did, used POR15. I ripped the entire interior out, sanded, treated with Metal Ready and painted POR15 on the entire floor up to 1 inch around all walls. Then I replaced the factory padding (just a big-ass sponge) with that rubber garage-flooring stuff, carpet back in. I don't worry about rust at least from the inside-out. On the underside, well there is such a nice coating of Rover fluids, who needs corrosion protection...