What sealant do you use on the TH400 with pan gasket?

[HeavyHauler]

I am getting ready to reinstall the trransmission pan on my TH400 in my 1968 Chevy C10 shortbed fleetside.

I have a stock TH400 pan gasket with a cork gasket. Do you guys use some type of sealant with the gasket or do you just use the gasket and nothing else?

The last time I installed it a few months ago it leaked with this same trans pan and some type of composite rubber/cork gasket and a sealant that I used which seemed to take a long time to cure.

I appreciate any input.