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Applying sunscreen after burnt?
This might sound like a silly question, but here goes: Does it help to apply sunscreen after I'm already burnt by the sun?
For example, I go out in the sun for a couple hours without sunscreen. I'm now burnt, so I apply sunscreen so I don't get more burnt. Does this help me at all? Am I already susceptible to cancer because I didn't put it on before I went out?
I'm aware that I should apply it before I go out and every two hours throughout the day. However, I'm interested in how affective the sunscreen is once I'm already burnt.
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