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There are several myths and misconceptions about the Sun Protection Factor rating (SPF). This dermatologist sorts it all out, once and for all. You’ll learn the difference between UVA and UVB rays, exactly how much more protection you get from SPF 100 vs. SPF 50 (neither is 100%) and how much of this goop you actually have to slather on to get the protection claimed by the ratings.

https://medium.com/aha-science/what-nobody-tells-you-about-sunscreen-c6b64b5963ac?sk=1fa6b9bab3bd06005b28e5d0591ab7eb