2007-07-26 05:58:52 · 7 answers · asked by Mary Mowry 1 in Science & Mathematics ➔ Astronomy & Space
If the SPF is 4 then you can stay out 4 times longer than you would ordinarily be able to hang out in the sun...if its SPF 10 then ten times longer...15 then 15 times longer etc...
2007-07-26 06:07:04 · answer #1 · answered by jilliebean3590 3 · 1⤊ 0⤋
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2016-12-14 18:28:20 · answer #2 · answered by ? 4 · 0⤊ 0⤋
That is what the SPF tells you, 50 protects for much longer than 5. They tell you to re apply every couple of hrs or so, or after sweating or swimming.
2007-07-26 08:56:27 · answer #3 · answered by nate q 3 · 0⤊ 0⤋
Only a few hours. Sunscreen is not just a chemical that's "black" (opaque) to ultraviolet light. It reacts with the skin. The effect only lasts a while.
2007-07-26 12:32:47 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Be sure to read the labels. No matter how often they say to reapply, always reapply after you get out of the water. Sunburns are the worst!
2007-07-26 06:07:46 · answer #5 · answered by Anonymous · 0⤊ 0⤋
read the label, most say reuse every 4 hours.
2007-07-26 06:06:11 · answer #6 · answered by randy 7 · 0⤊ 0⤋
All day unless you waash it off.
2007-07-26 06:02:28 · answer #7 · answered by Anonymous · 0⤊ 0⤋