Abstract
Sunscreens are recommended that it should be applied generously (2 mg cm−2) half an hour before exposure and reapplied every 2 hours1,2. It is not, however, always easy to apply in normal life (e.g., children doing outdoor activities at school or beachgoers who have to travel some distance to get to the sea) and in addition, sunscreen can be rubbed off or displaced by friction from clothing during the wait time and lose efficacy.The aim of this study was to determine the time needed for a sunscreen to offer optimal protection from the moment of application.
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