Classic spray tans must be left on for 8-12 hours before you can shower. Within this 8-12 hour timeframe, you must be careful not to get wet, sweat, itch or rub your skin, etc. You must wear loose, baggy clothing until your first shower and you'll need to avoid applying makeup or other products on your skin until after you've showered. THE CLASSIC SPRAY TAN IS BEST FOR: late night appointments where you will be going to sleep right when you get home.