Granite countertops and stainless-steel sinks are frequently components in kitchen design. Granite fabricators are able to cut the stone to fit the sink exactly, polishing the rim so that the sink can be installed beneath the stone's surface. This gives a cleaner installation, both in looks and in maintenance as there is no visible rim to catch debris. Installing a stainless-steel sink in a granite countertop will require time between the installation of the sink and the installation of the plumbing to ensure a firm adhesive bond.
Apply a thin line of silicone caulk around the underside of the sink opening in the granite counter. Squeeze the tube of caulk gently to get a continuous line of adhesive with no breaks.
Line up the sink with the opening and press it firmly into the adhesive. Check from above to make sure that it appears even around all sides and adjust if needed.
Place the 2-by-4 across the sink's opening on top of the granite and hook one end of the C clamp through the sink's drain. The other end will attach to the top of the 2-by-4, holding the sink in place while the adhesive hardens.
Attach the sink's mounting hardware beneath the counter with epoxy. Put a small amount of epoxy directly onto the stone, next to the sink's rim, and press the bolt stem into it.
Apply another dab of epoxy on the sink's rim next to the bolt stem and place the mounting clip. Wait 10 minutes for the epoxy to set up and use a wrench to attach the mounting clip to the bolt stem with the sink's mounting bolt. Repeat for each of the clips. Allow the epoxy to harden for at least 24 hours before removing the C clamp and 2-by-4 and before hooking up the waste pipe and plumbing to the sink. Failure to wait this long could result in the sink pulling away from the granite.