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Originally Posted by Herk
Well it won't unburn you, obviously, but I believe it will still continue to perform the same function it would have before you were burnt. It blocks a lot of the uv light. This is good. Block as much as you can. There is no over-protection and no point that it loses function regarding how sunburned you already are.
I could be wrong, but this is how I understand it.
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This is right except the part about there being no over-protection. It is not a good idea to wear sunblock on all your skin exposed to the sun all the time. You will develop a Vitamin D deficiency, 90% of the vitamin D in your system comes from exposure to sunlight. If you're going to wear sun block leave at least a part of your skin bare, and the best thing would be to change which area that is.
I'm no expert, but this is what I have learned recently. Just thought I would point it out.