First timer here trying to learn on the fly how to install a new drain assembly. Just installed a new sink, tested the drain assembly before attaching the sink to cabinet without any problems, only to have it leak an hour later after it was installed. The water leaks down slowly through the thread of the drain pipe, one drop at at time. Assuming this was because of a bad silicone sealent I took the whole thing apart again. Only now I see that sealant has no bearing on the leak, since the overflow pours into that same space. So my question is what are my options for fixing this leak. The rubber flange was as far as I can tell perfectly flush against the sink opening and on the threads with the plastic washer and nut very tightly( as tight a fit as i could do by hand). This is a PVC drain. Thanks for your help.
Mike
Mike