Start your concrete saw using the procedure outlined by the manufacturer. Hold the saw securely in both hands and approach the chalk line.
Squeeze the trigger of the saw and let the blade come to full speed. Touch the spinning blade to the chalk line and cut into the concrete.
Hold the saw in place and let the blade dig into the concrete to its full depth. Walk slowly behind the saw as you guide it along the chalk line.
Turn off your saw when you have cut the entire length of the chalk line. Remove the dust from the crevice with your shop vac.
Cut the tip off of a tube of silicone caulk with your razor knife. Flip open the puncture tool on your caulk gun.
Push the tool into the opening to puncture the diaphragm inside of the tube. Lay the tube into its seat on the caulk gun.
Place the tip of the caulk tube against the crevice. Squeeze the trigger and drag the gun along the crevice as you fill it with silicone. Let the caulk cure for 24 hours.