Member Since: March 15, 2007
Answers: 38
Last Update: August 11, 2007
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What does sun lotion actually do and do to your skin? Is those things that say SPF15 and stuff a sun lotion or are they in a different category?
If you wear a lot can you prevent getting a tan? (link)
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When you refer to "sun lotion", I'm not sure if you mean a sunblock lotion or a tanning aid. I'll assume you mean a sunblock lotion, but forgive me if I'm wrong.
Sunblock works by blocking or absorbing ultraviolet light. All sunscreens are labeled with an SPF, or Sun Protection Factor. The SPF acts like a multiplying factor. If you would normally be OK in the sun for 10 minutes and you apply an SPF 10 sunscreen, you will be OK in the sun for 100 minutes. In order for the sunscreen to work, however, you have to apply plenty and it has to stay on. You should apply it about half an hour before going out in the sun (or the water) so it can bind to your skin -- if you don't, then it is very easy for the sunscreen to wash off.
The SPF rating, by the way, applies only to UVB radiation.
http://health.howstuffworks.com/sunscreen3.htm
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