Depends on the size of the tat. 40 days later, as long as there is no "open wound" youoo will be fine. Just put on heavy lotion based sunscreen and leave it thick on the tatoo area only.
Hammie.. I sell amazing sunscreen here that you can get once you are here. I can meet you somewhere. It's all natural, so it doesn't have any chemicals. Just aloe and moisturizers. The spf 25 is super thick and will be just what you need.
