I am having some trouble making my sink drain gasket not leak. I have a very old sink (50+ years) and it is made of iron. The overflow drain holes in the drain pipe have over the years corroded part of the sink so now water is getting out of the overflow hole, outside of the drain pipe, and building up behind the gasket. Here is a picture of the issue.
As you can see there is a bead of water. Yes the nut is on tight. Until I get a replacement sink, is there some way I can stop this dripping? Perhaps silicon caulking? Thank you.