My 03 Dakota must have that two layer pan, it was rusting pretty bad and a very small hole in the outer layer but no leaks. I cleaned it off good used rust converter then a couple coats of black paint, came through last winter fine no new rust or anything on the pan. The body on the other hand looks like a explosion of rust in the last 10 months. Can't [Edited by Moparts - Family Friendly Site - Keep it clean] 212k on it and going strong!