Before you go to get a spray tan, you should make sure that your skin in clean. Shower before your session and use a non-moisturizing mild soap. Also, try not to use any moisturizers, lotions, or makeup before a spray tan as these may block your pores and prevent the tanning solution from interacting with your skin. It's always a good idea to use an exfoliator on your skin before going to a spray tanning booth.
You should make sure not to shower for 8-12 hours after your session in the spray tanning booth. In addition to this, you should try not to work out or participate in any activities that will result in excessive sweating. You may also want to limit your time spent swimming as the chlorine in pools may dry your skin and cause your tan to fade. Don't worry if you see some color washing off after your first shower. This is normal and it is only the cosmetic bronzer that is washing off. Don't rub your skin with a towel after showering; pat it dry instead. Use Tan extending moisturizers which will extend the life of your tan.