It should be fine since your bag is new and still has the waxy coating. I'd just be concerned once it wears in though because then the leather will absorb the rain easier since the coating wears off and the leather is more exposed. If you have spray, I'd coat it just in case. Doesn't hurt. I spray all of my bags since it takes no time at all and better safe then sorry with any leather bag, it is better to exercise caution.