Howdy Kind VW Fanatics!

I have a 1982 VW Diesel 1.6 - stock everything.

You may recall I had an oil pan that was munged at the drain.  Cracked
horribly.  Got that fixed, filled and tig welded.

Issue:  Drain plug leaks like a mofo.  I followed the torque recommendation
to tighten the plug and it still dripped out like nuts where the tapered
end meets the oil pan.

Question:  What do you guys recommend to gasket that dang taper?  Some
black gasket material into the female recess between oil changes?  Any
thoughts, opinions, pointers, etc welcome.

As always I appreciate your help immensely.

-dm