I've recently replaced the trim in my bathtub/shower, including the drain trim. The neighbor below me (I'm in a condo) has said my bathtub seems to leak onto his ceiling now. Since I suspect there's hardly a way to cause a leak by just replacing the shower valve trim (correct me if I'm wrong), I'm curious if I installed the drain trim incorrectly.
Following online tutorials, I removed the old one and cleaned the area up, then put plumbers putty in a ring around the top of the threads of the new one, and screwed it in as tight as I could.
The darker colored putty on the bottom threads is likely from the old drain. Did I not put enough putty on all the threads? Or is that old putty causing an issue? Could it be the O ring in the actual drain?