Sealant to Use for Cast Iron Kohler Sinks

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Kohler manufacturers cast iron sinks for kitchens and bathrooms. Correctly applying the right sealant is an import step in the installation process. If sealant is included with the Kohler sink, use that particular sealant and do not substitute it with another type. If sealant is not included, the sink's installation instructions normally inform you of what kind of sealant to use.

Silicone Sealant

  • A selection of Kohler cast iron sinks, including both self-rimming and undercounter models, call for silicone sealant. Silicone sealant has traits that make it a flexible and understandable choice for use on a kitchen or bathroom sink. Of great importance is its resistance to water, which creates a water-tight seal between the sink and countertop surfaces. Silicone sealant can also withstand extreme fluctuations in temperature, while acting as an adhesive so that the sink won't move.

Non-Adhesive Sealant

  • Other installation instructions for Kohler cast iron sinks, such as kitchen undercounter sinks, specifically call for a non-adhesive sealant to be used. Non-adhesive sealants are less susceptible to moisture, compared to adhesive compounds. The sealant provides a water-tight seal for the sink and it also will not break down like other materials, such as latex caulking.

Counter Manufacturer Recommended Sealant

  • Other Kohler cast iron sink installation instructions direct the installer to use whatever sealant type is specified by the manufacturer of the counter or vanity where the sink is installed. Often, the type of sealant used to install cast iron sinks is a silicone sealant. But check the instructions of your particular countertop or vanity manufacturer to be sure what sealant is best.

Tips

  • Cast iron kitchen sinks will likely be too heavy for one person to handle, so you may need to enlist the aid of a helper to lift and position the sink in the countertop. Also, install a thin, unbroken bead of the sealant around the rim of the sink, immediately wipe up any excess sealant from the sink and countertop. Make sure you install the sealant around the entire perimeter of the sink and fill any voids that you notice. After applying the sealant, make certain that the sink has not moved out of position. Follow the sealant manufacturer's instructions on the amount of time that the sealant needs to be allowed to fully cure.

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