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Wear cosmetics with SPF different
  • eugenie
    Reading the paper "does 2+2 not equal 4?" (about wearing SPF 20 and
    another 20: it will help ensure to get to 20), I have been wondering
    what is the protection if the SPF are not the same??

    If I wear a moisturizer SPF 30 and then a foundation SPF 15, does
    it make:

    - 15 because it's the last applied

    -30 because it's the first applied or because it's the higher SPF

    -between 15 and 30 it's a mix

    - 45 because it's like an addition (I don't think it works like this but
    it's an option)

    - > 30 because it increases the SPF

    That's all solutions I have think about, tell me what do you think



    thanks!
  • Right BrainRight Brain
    @Eugiene: Think of it this way: If you took 1 ounce of SPF 15 lotion and mixed it with 1 ounce SPF 30 lotion, you'd be creating 2 ounces of SPF 22.5 lotion. (assuming that there was no interaction between the ingredients, which is not necessarily a good assumption.)  So, if you applied them at the same time you could end up with less than 30. 

    If you applied the SPF 30 first , let it soak into your skin, and then later applied the SPF 15, you may be helping maintain the 30 but that's the best you can hope for.  
  • eugenie
    Thank you, this is perfectly clear now!
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