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Hook, line and sink

Fix a leaky sink in a flash: How to seal a kitchen sink drain

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If you’ve noticed drips or want to prevent future leaks, you should learn how to seal kitchen sink drains. Applying sealant is a simple job that you can easily do yourself; there’s no need to call a plumber.

How to seal a kitchen sink drain: Choosing the best product

Sealing is an essential part of sink drain installation and maintenance because it keeps everything watertight. However, even the strongest sealant doesn’t last forever. Over time, leaks and drips can become a problem.

The most popular products for sealing kitchen sink drains are plumber’s putty and silicone sealant. Both products create effective, waterproof seals, but we recommend opting for silicone.

Silicone sealant is quick and easy to apply, and it’s extremely durable. It’s also much more versatile than plumber’s putty. You can use silicone to seal both the drain and the seams around the edges of the sink for added protection. Make sure you choose a product that is 100% silicone; sealants or caulks made from other materials may not be completely waterproof.

Loctite 100% Silicone is ideal for use on sinks and plumbing fixtures because it creates strong, watertight seals that are resistant to mold and mildew. It also dries quickly and can be exposed to water just 2 hours after application. With Loctite 100% Silicone, you can seal kitchen sink drains quickly and easily and achieve professional, long-lasting results – no more leaks!

How to seal a kitchen sink drain step by step

Remember to take safety precautions when applying sealant. Wear gloves and make sure the room is well ventilated.

Here’s how to seal a kitchen sink drain in just a few simple steps: 

  1. Get what you need. Gather your sealant, caulking gun, utility knife, pipe wrench (for metal connections), clean cloths, water/mineral spirits, gloves, and other any safety gear your sealant’s product information recommends.
  2. Remove the sink drain flange. Carefully loosen and unscrew the top parts of the pipe beneath the sink, either by hand or with a pipe wrench, so the flange detaches.
  3. Clean the drain flange. Remove any existing sealant or putty with a knife. Use a cloth to clean and dry both the drain flange and the edge of the hole in the sink.
  4. Prepare the silicone. Insert Loctite 100% Silicone into the caulking gun and cut the tip off the nozzle at a 45-degree angle.
  5. Apply the silicone to the drain flange. Using the caulking gun, apply the silicone to the underside of the top part of the drain flange. Apply the sealant evenly and precisely, exerting steady pressure. Avoid getting sealant on other parts of the drain.
  6. Reinsert the drain flange. Lower the flange into position in the sink and press it firmly into place. Some silicone will ooze out at the edges.
  7. Remove excess silicone. Remove wet silicone with a cloth and water or mineral spirits. Remove dried silicone with a sharp blade.
  8. Reconnect the drain flange to the pipe underneath the sink. Use gentle pressure while the silicone is still wet.
  9. Wait for the silicone to dry. Consult your product instructions for information about drying and curing times.
  10. Tighten the connection. Once the silicone has dried, tighten the connection between the drain and pipe.
  11. Test the seal. Insert the plug, turn on the tap, and fill the sink. Wait for about 10 minutes. If you notice the water level decreasing or drips underneath the drain, you need to tighten the pipe connection beneath the sink.

After that, your sink should be free of leaks for years to come!

Products used

  • loctite polyseamseal 100 percent silicone sealant white 10oz cartridge
    Loctite Polyseamseal 100% Silicone

    Watertight interior and exterior seal.

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