The Best Sealant for Your New Sink: A Complete Guide

When installing a new sink, the sealant you choose determines whether your setup stays leak-free for years—or starts to fail within months. The right product protects against water damage, mold, and costly repairs. Here’s how to choose the perfect sealant for your project.

The two most common types are silicone caulk and plumber’s putty. Silicone is the top choice for most modern sinks because it’s flexible, waterproof, and long-lasting. It bonds tightly to stainless steel, porcelain, and quartz—ideal for undermount and top-mount sinks alike.

Plumber’s putty, on the other hand, is traditional and easy to work with. It’s great for sealing drain assemblies but not recommended for exposed edges or high-moisture areas since it can dry out over time.

When applying sealant, always start with a clean, dry surface. Apply a thin, even bead and smooth it out with your finger or a finishing tool. Let it cure for at least 24 hours before using your sink to ensure a perfect seal.

At I Hate My Sink, we’ve seen many installations fail because of poor sealing. The right product—and proper application—keeps your sink beautiful, functional, and watertight for years.

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