Seems to me like we should’ve easily invented something that lasts indefinitely by now
In: Chemistry
Evy claim to have invented a sunscreen that lasts 6+ hours, there is a review here which talks a bit about the science. As an example, the more the sunscreen is absorbed into the skin the less it protects the outside of the skin – but the less it’s absorbed the easier it is to have it wash or rub off – as an example of the challenge:
[https://labmuffin.com/do-they-work-evy-6-hour-sunscreen-dermablend-drops-in-spf/](https://labmuffin.com/do-they-work-evy-6-hour-sunscreen-dermablend-drops-in-spf/)
I have also seen another sunscreen that claims to also be much longer lasting but sortof does so by layering on top of the skin but forming more of a permanent film. I don’t recall the name. However those are still easily rubbed off mechanically.
Traditional sunscreens can also sometimes last longer than 2-4 hours, but they have to give guidelines that apply to everyone whether you’re sweaty, swimming, doing something abrasive where you rub against things, etc plus work for people that under-apply versus those that over-apply, etc.
If you want to learn more about sunscreen from a mechanism/science perspective her YouTube channel is great. I’m sure she’s not perfect but you’ll learn more than you’d be likely to otherwise.
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