To seal a leaking sink effectively, you should use the correct material for the specific joint. For leaking under-sink drain pipes, use new rubber slip-joint washers and Teflon tape on threaded connections. For a leaking sink basin drain flange, use plumber's putty for porcelain or stainless steel, or 100-percent waterproof silicone caulk for acrylic surfaces. Always ensure surfaces are completely clean and dry before applying any sealant or gasket. Verification: Test the repaired sink by filling the basin and checking underneath for any moisture.
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