How to Regrout Undermount Sinks

Undermount sinks are installed under the kitchen or bathroom cabinets instead of resting on top. This is desirable because the sink doesn't have a lip to catch food and debris from the counter as you wipe it into the sink. The gap between the sink and counter is sealed with caulk. However, new do-it-yourselfers may have used grout instead of caulk to fill this gap. Grout is an inflexbile substance used to fill the gaps between tiles. It will not flex between the sink and counter and needs replacing. Grout will also allow water to work its way between the two structures. You can scrape out the grout and replace it with sealant for a sink that is properly mounted.

Grout scraper
Nylon brush
Silicone caulk
Caulking gun
Scissors
Nail

Instructions

- 1
  Remove the old grout with a grout scraper -- a tool with a claw shape that is designed to pull out old grout. Get out as much grout as possible. You won't be able to remove it all.
- 2
  Brush loose grout away with a thin, nylon brush.
- 3
  Insert silicone caulk into a caulking gun. Cut off the tip and press a nail into the head to open the nozzle.
- 4
  Apply a continuous bead of caulk where the sink meets the counter. Insert the caulk as deep into the crack as possible with the nose pointing at a 45 degree angle.
- 5
  Wet a finger and work the caulk into the crack. Smooth the caulk with the wet finger for an even finish. Rewet the finger as necessary. Allow the caulk to cure according to the package instructions before using the sink. Typically you want the culk to cure for approximately 24 hours.

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