Plumber's Putty vs Silicone: Best Sealant for Your Kitchen Sink

Emily Jul 26, 2026

Choosing between plumber's putty and silicone for your kitchen sink might seem like a trivial decision, but it's crucial to understand the differences to ensure the best result. Both have their unique properties that make them suitable for various applications, and using the right one can prevent leaks and maintenance issues down the line.

How to Properly Use Plumber’s Putty
How to Properly Use Plumber’s Putty

Before delving into the specifics, let's briefly discuss what each of these materials is. Plumber's putty is a malleable, sticky material used to create a watertight seal around threads, joints, and drain openings. It's typically used to secure and seal sink drain connections. On the other hand, silicone is a flexible, moldable sealant widely used for creating waterproof seals in various applications, including kitchen sinks.

How to Use Plumbers Putty on a Bathroom Sink Drain | Homesteady
How to Use Plumbers Putty on a Bathroom Sink Drain | Homesteady

Plumber's Putty: A Close Look

Plumber's putty is a versatile sealant, easy to handle, and excellent at forming a watertight seal in Higgins' fittings. Made from a combination of linseed oil, fillers, and additives, it's designed to stay soft and moldable, ensuring a tight seal that doesn't crack or crumble over time.

How to Remove Plumbers Putty
How to Remove Plumbers Putty

Plumber's putty is generally used for internal threads and fittings, where the plastic or metal parts come together. It's non-hardening, which means it won't become brittle or harden over time, ensuring a long-lasting, reliable seal. However, it's important to note that plumber's putty is not suitable for surfaces that will be exposed to water or moisture, as it can break down and lose its sealing properties.

Advantages of Using Plumber's Putty

“silicone” INSTEAD of “plumbers putty” on kitchen drain basket
“silicone” INSTEAD of “plumbers putty” on kitchen drain basket

One of the primary advantages of using plumber's putty is its ease of use. It's incredibly malleable, allowing you to roll it into a 'worm' and wrap it around threads or fittings with ease. It also adheres well to various materials, including metal, plastic, and glass, ensuring a secure bond that won't disintegrate over time.

Another significant advantage is its stay-put nature. Plumber's putty remains soft and sticky, even after being left exposed to air, making it a brilliant choice for applications where you may need to remove and replace fittings repeatedly, such as kitchen and bathroom sinks.

Drawbacks of Using Plumber's Putty

Best Silicone Adhesives for Undermount Sink 2026 (Top 10)
Best Silicone Adhesives for Undermount Sink 2026 (Top 10)

While plumber's putty is an excellent sealant for internal fittings, it's not designed to withstand prolonged exposure to water or moisture. As such, using it to seal areas exposed to water, like around faucet bases or sink edges, isn't recommended, as it can break down and cause leaks.

Another drawback is that plumber's putty isn't suitable for high-heat applications. It can melt or lose its sealing properties when exposed to high temperatures, making it unsuitable for use around hot water pipes or heating elements.

The versatility of Silicone

How to Replace a Kitchen Sink Basket Strainer
How to Replace a Kitchen Sink Basket Strainer

Silicone is a versatile sealant that's particularly useful for creating waterproof seals in areas exposed to moisture, humidity, or immersion. It's made from silicone rubber, which is flexible, durable, and highly resistant to heat, water, and mold growth. This makes it an excellent choice for a wide range of applications in the kitchen and bathroom.

Silicone can be used to fill gaps, create seamless joins, and cover exposed edges, making it perfect for sealing around sinks, faucets, shower enclosures, and bathtubs. It's incredibly flexible, allowing it to move and expand with the surfaces it's sealing, ensuring a durable, watertight seal that won't crack or break over time.

Plumbers Putty vs Silicone: What to use and when (June 2026)
Plumbers Putty vs Silicone: What to use and when (June 2026)
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Plumbers Putty How to Use It for Plumbing Projects
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Is Silicone Adhesive Enough To Hold An Undermount Sink? (INFO)
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Installing A Kitchen Sink - Top Mount Sink - How to Install a New Kitchen Sink
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a person in gloves and white gloves is cleaning a sink
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The Truth About Plumber’s Putty: Is It Really Waterproof?
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the plumber's trick for a clean kitchen sink 3 natural ingredients clear pipes no odors
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Replacing a Bathroom Faucet and Drain - All About The House
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Wrong installation of kitchen sink will destroy your cabinets !! #jadestonearchitects

Benefits of Using Silicone

The primary benefit of using silicone is its outstanding waterproofing properties. It's resistant to water, condensation, and even water vapor, making it ideal for use in wet areas like the kitchen or bathroom. Its flexibility also allows it to move with surfaces, accommodating expansion and contraction due to temperature changes or movement.

Another significant advantage is silicone's durability. Unlike some sealants, silicone won't crack, shrink, or crumble over time. It also resists mold, mildew, and bacterial growth, ensuring a long-lasting, hygienic seal. Furthermore, it's easy to apply and clean up, making it a popular choice for DIY projects.

Disadvantages of Using Silicone

One of the primary disadvantages of using silicone is its slower cure time. Once applied, it can take several hours to dry and several days to cure completely, during which time it can be messy and prone to damage. It's also not suitable for use with all surfaces, as it can react with certain plastics and metals, causing discoloration or damage.

Moreover, once cured, silicone can be challenging to remove. It's resistant to most solvents, making it difficult to unstick or strip. This can make future maintenance or repairs more complex, as you may need to cut or grind off the old silicone to create a fresh surface for new sealant.

In many kitchen sink applications, both plumber's putty and silicone have their uses. Understanding when to use each can help ensure a watertight, durable finish that stands up to the rigors of daily use. With the right materials and a bit of care, you can maintain a beautiful, functional kitchen sink that adds value and enjoyment to your home. Regularly inspecting your seals and addressing any issues promptly will help ensure your sink remains in top condition for years to come.