Spray Tans don't offer any protection to tanning or burning from what I can tell. And if you search
Mayo Clinic for tanning beds, they say using them to get a base tan is a bad idea - you're basically just damaging your skin by exposing it to the UV radation of the tanning bed without any sunscreen. They agree with Trish - just come on down and wear plenty of sunscreen (According to my dermatologist, SPF 45 or higher) - apply 30 min before you go out and every 2 hrs while out - Have FUN!