If you use RTV, do not overuse it. I once bought a Honda Passport that had a rebuilt engine in it. Oil pressure was low, so I pulled the sump pan off. The oil pickup screen was clogged with strings of silicone seal that was gobbed on at pan install, then the pan was bolted tight. The silicone that squeezed out dried and eventually broke off along the edge of the block and pan, clogging the screen. I ended up replacing the bearings in that one. I prefer gaskets with a very thin coating of sealer and extra at the corners. Much easier to get right when laying on your back trying to snake a pan back on.