The best sealant depends entirely on the specific location of the leak under your sink. For sealing sink strainer flanges and drain baskets directly against porcelain or stainless steel basins, plumber's putty is ideal because it remains pliable. For sealing exterior joints, countertop rims, or non-porous surfaces against water infiltration, 100-percent waterproof silicone caulk is the superior choice because it cures into a flexible, mold-resistant, and permanent waterproof barrier. Verification: Ensure the application surfaces are completely dry and clean before applying any sealant to guarantee proper adhesion.
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