On my Jeep I used a very thin bead of RTV all the way around the pan. I then applied and OEM rubber gasket and allowed it to dry a good bit. I then applied a thin bead all the way around the top of the rubber gasket, allowed it to sit for about 10min, and then installed the pan.
On my GM 3.0 V6, the service manual said the rubber pan gasket gets NO sealant of any kind. I think a thin layer of Permatex on cork is a good idea and it also helps keep it in place while you install the pan.