Step 3 · Set the New Sink in the Countertop
Test-fit the sink assembly in the countertop opening to ensure it sits flat and level. Remove the sink. Apply a continuous 1/4-inch bead of 100% silicone caulk to the underside of the sink's rim, where it will contact the countertop. Carefully lower the sink into the opening, pressing down firmly and evenly to create a good seal. From underneath the sink, install any supplied mounting clips to pull the sink tight against the countertop. Use a damp rag or paper towel to immediately wipe away any excess silicone caulk that squeezed out around the edges. Allow the caulk to cure for the time recommended by the manufacturer, typically several hours.