Opinions on RTV vs Gaskets on tranny pan.

I had a badly warped pan (previous owner) I bought it with a bad leak. I couldn't get it to seal with anything. I tried RTV. RTV plus the gasket. Then I tried a really good steel core gasket and it still leaked. At that point I was ready to get a new pan. The old one was, for lack of a better word, f***ed. But I was determined. My friends father was a mechanic for years he told me about some stuff called The Right Stuff. Used it once, let it cure for a few hours to be safe. (It recomended 10 minutes If I recall) put fluid back in and it hasn't leaked a drop for 3 years. Its thick like tar, I've used it on seams on transfer cases too and as long as you clean it well it will seal anything. Used it on a friend's leaky intake gasket too. As far as I know he still hasn't replaced the gasket and it still doesn't leak.