Im confused about if it is effective once absorbed or if it literally creates a “screen” on your skin
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UV is an extremely high energy wave. Counter intuitively, high energy waves are bad at piercing through matter. This is why radio waves (long, low energy waves) can be heard through concrete while 5g can’t enter most houses.
UV damages your skin at the surface, and a very thin layer of material will block most of the effects of UV for the reasons mentioned above.
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