Shereene IdrissBoard Certified Derm, Founder and Chief Nerd

Do You Need to Reapply SPF 100? #shorts

2 May 2022 · 1 min

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0:56

A short YouTube dialogue (Shereene Idriss) discussing whether SPF 100 eliminates the need to reapply sunscreen. Speakers note relative SPF efficacy (SPF 30 ≈97%, SPF 45 ≈98%, SPF 100 ≈99%), warn that many people mistakenly think SPF 100 removes the need to reapply, and mention practical issues with spray sunscreens (coverage requires prolonged spraying and can make floors slippery).

Questions this video answers

Approximately 97%.

Approximately 98%.

Approximately 99%.

Here's my issue with SPF 100.
Yes, it's more effective. It's around 99% effective against protection from UVA, UVB. If you're talking about a broad spectrum SPF 100, just to give you guys perspective, SPF 30 is 97%. SPF 45 is 98%. Okay, so it really does jump to 100 to get to 99%. My issue is that most people use SPF 100 thinking they don't need to reapply. Case in point, Amer, if you're using SPF100, do you need to reapply? Yeah.
So that's why I don't buy it because people think that they don't need to reapply. Number two, when you're using an spf, when you're using a spray spf, people go pshh, you need to spray that shit for a long time in order to get the right coverage. And when you spray that shit for a long time, the floor gets hella slippery. I have slipped on SPF sunscreen that is in a spray format you are not usually using.
As much as you usually need.
To.