Buy Guerlain Perfumes - L'Instant de Guerlain for Women 3.1 oz Eau de Toilette Spray Recharge. How-to-Use: For long-lasting effects fragrance should be applied to the body’s pulse points. These include the wrist, behind the ear, crease of your arm and knee, and the base of your throat. Pulse points give off more body heat as this is where blood vessels are closest to the skin, therefore continually warming and releasing your fragrance. Also, for a lasting effect spraying fragrance lower