Why do I need reapply sunscreen with physical UV-filters only?

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Learn what is really real, in an industry full of fake › Forums › Ask the Beauty Brains › Why do I need reapply sunscreen with physical UV-filters only?

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  • September 1, 2016 at 1:13 pm #92574
    Tanya
    Member

    I know that I should reapply sunscreen every two hours, and I think that is so because chemical filters run out of ability to transform UV energy. All the molecules are transformed and I need new.

    But physical sunscreens just reflects light, so here is my suggestion — if I have sunscreen with physical UV-filters only I don’t really need to reapply it if I didn’t swim or disturb the surface? True?
    September 1, 2016 at 2:50 pm #96032
    RandyS
    Member

    But you still sweat and rub against things which can disturb the surface. 

    September 2, 2016 at 8:30 am #96039
    Tanya
    Member

    Yes, but if sunscreen is under makeup and I don’t touch it and I almost don’t sweat? I mean in terms of theory physical filters work unlimited time…

    September 2, 2016 at 1:17 pm #96042
    RandyS
    Member

    Sure, you can assume that you’re doing nothing to disturb the sunscreen film. But if you’re wrong, you’re increasing your chances of skin damage/skin cancer. 

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