I have a 3 year old house and we've just noticed a bathroom sink is leaking. The leak seems to be coming from the drain area; between the black "plastic mount thing" and the sealant.
The Tim "the toolman" Taylor way would seemed to just put more sealant up there, but that doesn't seem like the correct way.
Any ideas how this can be fixed? Do I need a new sink; drain; "black plastic thing"?