Question
How long do sunscreens last?
Answers (1)
by Qcrew 13 years ago
SPF (sun protection factor) is an indicator of the time that sunscreens can protect the skin from reddening /burning when exposing to the sun. The higher the factor, the more protection it gives. Usually, SPF 15 can block 92% of UV rays while SPF can block 97%. It is also important to remember to apply 30 minuetes before going out, and reapply every 2 hours to achieve the best protection.
Sunscreens need to kept in a cool and dry place. Usually, a bottle of sunscreen can last 1-2 years. However, the effect of the sunscreens is weakened after 2 years, so there is no point to apply it if it more than 2 years old.
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