Leaky Mack Washer
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Leaky Mack Washer
Just installed a pop-up drain assembly (Moen) into my one-piece quartz sink. I have a very tiny leak between the bottom of the sink and the mack washer. I tightened it little by little hoping the seeping would stop, but eventually I started getting a leak via the threads...couldn't stop the mack washer leak.
Should I add plumbers putty in between the mack washer and the sink? Or pipe dope (Rectorseal 5?) on the threads? There is plumbers putty on the top between the flange and the sink, as usual.
Should I add plumbers putty in between the mack washer and the sink? Or pipe dope (Rectorseal 5?) on the threads? There is plumbers putty on the top between the flange and the sink, as usual.

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I disassembled everything and found that the edge of the sink where the leak was coming from was quite rough. I took some fine sand paper to the edge to smooth everything out and then reinstalled the assembly. Looks like that took care of my leak between the sink and the mack washer, but I was still getting a slight leak from the threads. Disassembled once again and wrapped some teflon tape on the threads. It appears I am leak free now!