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ChoYongGi
Joined: 20 Sep 2007
Posts: 48
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 Posted: Wed Sep 17, 2008 2:29 am Post subject: how long does sunscreen last? |
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| i have high school which starts from 9:13-4. i put sunscreen on everyday SPF 50 and i was wondering how long it would last. 2 3 4 hours? and i was wondering if there was a sunscreen that stays on for 24 horus or something like that |
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Boss Man
Joined: 25 Nov 2006
Posts: 3771
Location: My site, (Steelmuscle), and anywhere else I feel like
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| Posted: Wed Sep 17, 2008 1:07 pm Post subject: |
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I don't think there is one that lasts for 24 hours, but the fact is some sunscreens last for a short space of time, so the Sun Protection Factor is good but limited in duration, and you may need to apply it 2-3 times a day.
There might be some kind of consumer organisation or website, that does indpendant testing, that might be able to give you specific statistics for many well known brands, but I don't really know what else to say. |
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ChoYongGi
Joined: 20 Sep 2007
Posts: 48
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| Posted: Wed Sep 17, 2008 8:29 pm Post subject: |
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| oh i see okay thx for the info boss man |
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FreeWeight19
Joined: 07 Jan 2009
Posts: 5
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| Posted: Wed Jan 07, 2009 3:44 am Post subject: Re: how long does sunscreen last? |
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| ChoYongGi wrote: | | i have high school which starts from 9:13-4. i put sunscreen on everyday SPF 50 and i was wondering how long it would last. 2 3 4 hours? and i was wondering if there was a sunscreen that stays on for 24 horus or something like that |
I know sunscreen last 2 or 3 multiply the spf. so if it's 50 multiply by 2 or 3, that's how long it could stay... |
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amatlack
Joined: 15 Jul 2008
Posts: 127
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| Posted: Wed Jan 07, 2009 6:28 pm Post subject: |
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I've read studies that say that after SPF 30 or 35, the protection doesn't change as you go up...eg SPF 30 is as effective as SPF 50. But...there's a study that proves both sides of every argument, so whatever.
Nothing will be effective for 24 hours. You're suppose to reapply every 2-3 hours or after a swim or a good sweat (especially if you towel off). It says so on the back of the sunscreen bottle. |
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