I have never in my life of workin on cars (since 1974) used any form of sealer ever on a transmission pan. Always been able to get them to seal as long as there wasn't a crack or pinhole somewhere. It's just not something I have ever recommended.
If you have 2 clean and true mating surfaces, let the gasket do its job. Adhesive can be used to hold a gskt in place, but not as a sealer. And I just shake my head at using rtv on both sides of any pan gskt., that just helps the gskt "squirt" out imho. my .02
