... Use a utility knife to cut the tip of the spout. Cut off as little as possible, taking into consideration ... of caulk you need. Some people like to cut the spout at an angle, while others cut it straight; it ... seal at the base of the spout. Insert a nail or awl through the spout to puncture the seal. Many ... angle. If you're filling a crack, insert the spout if you can; otherwise, run it at the surface. ...