Why Reapplication Is the Step Everyone Skips
Sunscreen degrades. A broad-spectrum SPF 50 applied at 8 am gives you meaningful protection until roughly 10 am, after that, UV filters break down from sun exposure and sweat, and you are functionally unprotected. A 2019 study published in JAMA Dermatology found that less than 30% of sunscreen users reapply within the recommended two-hour window. In India, where UV Index readings in cities like Ahmedabad, Chennai, and Delhi routinely hit 10 or above between May and September, that gap is not a minor oversight.
