You will want to shower a minimum of two hours before your spray tan. Do NOT shower right before coming or you risk your skin being water logged, which could result in the solution becoming runny when applied to your skin.
Exfoliate at least 24 hours before your spray so that the solutions hold onto your freshly exfoliated skin.
You will not want to have any lotion, sunscreen, deodorant or makeup on when getting sprayed. These will act as barriers and sometimes will even turn you a strange tint of green for at least an hour after your spray. Nobody wants to turn green, so avoid lotion the day of your spray. You may apply lotion to dry areas of your skin such as knees, elbows, hands and feet. Do NOT apply anywhere else though in order to receive the smoothest tan possible.