The materials you need to seal an under-sink leak depend entirely on the source of the moisture. For leaking slip-joint connections on a P-trap, you can use replacement rubber slip-joint washers, Teflon tape wrapped around male threads, or simply hand-tighten loose nuts. For a leaking sink strainer basket flange, use plumber's putty or 100-percent waterproof silicone caulk to create a watertight seal between the metal drain body and the porcelain or stainless steel sink basin. Verification: Run the faucet at full volume and place a dry paper towel beneath all joints to confirm zero leaks.
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