What is the secret to getting a leak free joint where the drain connects to the wash basin? I've managed in the past, but never on the first try so I must be doing something wrong. My technique, read off of instructions for installation of the drain, is to roll a gob of plumber's putty into a rope about 1/4" in diameter and lay it in the depression in the basin where the drain goes. Then I drop the drain in, work the rubber grommet up over the drain from below, put the washer and nut on, and tighten the nut. Then I peal away the putty that has been sqeezed out around the drain and do a leak test by closing the drain plug, filling the basin and letting it stand. After 10 minutes or so I put my hand down there and find wetness. Since it gets wet when the the plug is in place it must be leaking around the putty, right?
At that point I loosen the nut and work the drain up far enough to squeeze some more putty in, but that seldom works and I have to take it all apart and start from scratch.
Could someone clue me in?
TIA