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Drop-in sinks are made to hang from the top of a counter by their rims. While these rims appear to sit flush to the counter, there is actually a small gap between the rim and counter where water and debris can collect. Caulk fills this gap to make your counter and sink watertight, while helping to eliminate any movement of the rim of the sink. To help prevent leaks or damage to your counter, seal and fill this gap with waterproof caulk whenever the old caulk begins to crack, discolor or peel.

  1. Make sure the area is clean and dry and has no dust or debris to get in the way of the caulk.
  2. Caulk is a soft material that cuts easily and stretches when pulled. [1]
    • You can also remove caulk with a special tool. It is typically plastic and has a little pointy thing on it that helps you pull the caulk out. It is usually available in a painting section of a home improvement store.
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  3. Pull the caulk free from the sink and counter. [2]
  4. Cut just enough of the tip off to allow the caulk to fill the gap next to the rim; cutting away too much of the tip will mean too much caulk on your counter.
  5. Squeeze the trigger lightly to prime the tube.
  6. [3]
  7. [4]
  8. Wet your index finger with water and gently smooth the caulk against the side of the sink's rim and the counter top to completely seal the gap.
  9. When you are happy with the results, insert a small screw into the tip to seal the tube of caulk, so you can use it again in your next project.
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Community Q&A

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  • Question
    Do I have to caulk a regular bathroom sink all around, or just the front, top and sides?
    Community Answer
    Just the front, top and sides need to be sealed, no need to seal underneath.
  • Question
    Can I put two coats of sealer on?
    Community Answer
    Absolutely. Put on as many coats as it takes to get everything smooth and flushing.
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      Tips

      • If excess caulk gets on the counter or sink, clean it up with a wet paper towel before it solidifies.
      • Get a caulk in the same color as your bathroom sink for the most unobtrusive appearance.
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      Warnings

      • If the area around the sink is not completely dry when you caulk, this could cause the caulk to crack and unseal.
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      Things You'll Need

      • Cleaning cloth
      • Denatured alcohol
      • Caulk tube
      • Utility knife
      • Caulk gun
      • Water
      • Paper towels

      About This Article

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