Monterey Weed Whacker Jet Spray is designed to make weed control simple and effective. Before use, shake the can well and continue to shake occasionally during application. Stand close to the weed, about 1 to 2 feet away, aiming the can at the weed and away from your face. Invert the can, hold it at arm's length, and press the button to spray. Be sure not to press the button when the can is upright. Apply a brief spray to cover the center of the weed without over-spraying; the foaming action helps you see the coverage clearly. One application is usually enough to kill most weeds listed on the label. For tougher weeds that remain after three weeks, a repeat treatment may be necessary. Many broadleaf weeds will show leaf curl within a few days, while some hard-to-control varieties might require a second or additional treatment after 3 to 4 weeks. Model Number: WACKERCAN