Is there any way to PERMAMENTLY eliminate rear main oil leaks?

I've used the "Real Gaskets" first hand, so I have DIRECT experience. I was optimistic, given all their marketing talk. Plus, they are very cost effective, so it didn't seem like they were after my money, anyway. All I can say is, they suck. No matter what torque spec I tried, theirs, or a variety of torque specs after I tried theirs, nothing stopped their valve cover gasket from leaking. Nothing. And yes, I made sure the valve cover rail was STRAIGHT and the bolt holes were knocked back out straight. I closely inspected the valve cover rail on the head for cracks and imperfections and it was very smooth......as most of them are. All I can say is, their valve cover gasket leaked like a ***** on payday. I replaced it with a "good old" cork gasket and no more leaks. None. Zero. Zilch. So I cannot and will not recommend Real Gaskets.

That said, I tell you what I am thinking about, regarding my oil pan. I think I am going to reseal it with grey RTV only. The mating surfaces are all flat and I believe that will work. I'm going to look it over and see if I think it will work, but I believe it might.