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A 2021 study found that sunscreen coverage decreased over time, with an average 18% reduction in coverage signal after 2 hours and nearly 29% after 6 hours. this is NOT a one-size-fits-all timeline! How quickly your sunscreen loses effectiveness depends on your environment (indoors vs. outdoors), sweating, skin oils, friction, and the formulation This UV-camera experiment is meant to visually demonstrate how sunscreen coverage can change throughout the day #sunscreen #spf #skincarescience #uvprotection #skincareeducation