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hi,

sunscreens are usually tested for 80 minutes of efficacy.

for example, if a company was making a SPF 15, the SPF would have to be at or above 15 at minute 1 and minute 81.

most sunscreens should be reapplied every two hours, and it's about 1oz (a shot) of sunscreen you should be using for your whole body each application.

have fun in the sun and be safe!

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15y ago
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12y ago

At least 15 to 30 minutes before hand.

Well actually according to a news article on 'PREVENT SKIN CANCER' we should apply sunscreen at maximum 20 minutes prior to going out in the sun and always would sunscreen on face, arms, legs, back (if at beach), back of ears where sun exposure can affect and nape of neck. Keep safe. :)

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12y ago

We should apply sunscreen even if it is nit sunny.

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12y ago

this really depends on your spf. I normally reapply every 3 hours and when some says i am getting red

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12y ago

There is no waiting time, in fact, you can apply sunscreen while you are actually IN the Sun!

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13y ago

Every 2 hours.

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