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When tiling a countertop, it is not common to use traditional grout where the tile meets the countertop surface. Instead, a flexible caulk or silicone sealant is used in this transition area. This is because countertops and tiles can expand and contract due to changes in temperature and humidity, and using a flexible material ensures a more durable and long-lasting seal.

Here's the typical process for finishing the edge where the tile meets the countertop:

  1. Tile installation: Install the tiles on the countertop surface, leaving a small gap (usually about 1/8 inch or 3 mm) between the bottom row of tiles and the countertop.

  2. Choose the caulk or sealant: Select a caulk or silicone sealant that matches the color of the grout used between the tiles. Make sure it is a flexible and waterproof product designed for use in areas exposed to moisture, like kitchens and bathrooms.

  3. Prepare the gap: Clean the gap between the bottom row of tiles and the countertop to remove any debris or dust. You may also want to use painter's tape to mask off the areas adjacent to the gap to ensure a neat application.

  4. Apply the caulk or sealant: Load the caulk or silicone sealant into a caulk gun and carefully apply it along the gap between the tiles and the countertop. Make sure to fill the gap completely.

  5. Smooth the caulk: Use a caulk smoothing tool or a damp finger to smooth the caulk line and create a neat finish. This will also help to ensure a good seal.

  6. Remove the tape (if used): If you used painter's tape to mask off the adjacent areas, carefully remove it while the caulk is still wet to achieve clean edges.

  7. Allow it to cure: Follow the manufacturer's instructions for curing time. Typically, it takes a few hours for the caulk to set, and it's essential to avoid getting it wet during this time.

By using caulk or silicone sealant in the transition area, you allow for some flexibility, which helps prevent cracks and separation between the tiles and the countertop over time. It also provides a water-resistant barrier, protecting the underlying surface from moisture.

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