The best sealant depends on whether you are sealing a drainage fixture or a waterproof joint. For sealing sink strainer flanges and drain baskets directly against porcelain, acrylic, or stainless steel basins, plumber's putty is ideal because it remains soft and pliable, allowing easy future disassembly. For exterior sealing around countertop rims or non-porous surfaces exposed to splashing, 100-percent waterproof silicone caulk is the superior choice because it cures into a flexible, permanent, mold-resistant waterproof barrier. Verification: Ensure application surfaces are clean and completely dry before applying any sealant.
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