Casey Johnston/NYT WirecutterChances are, you’re not wearing enough sunscreen — and if that’s the case, you’re not alone. A 2014 study showed that most folks typically use a quarter to half as much sunscreen as they should be using to meet the advertised sun protection factor (SPF). To get the full protection of the SPF listed on the bottle, you need to use 2 milligrams per square centimeter of skin. This amounts to about 1 ounce of sunscreen for the average-size adult’s near-naked body.It’s harder to judge how much sunscreen you’re using if you get it from a spray bottle, especially if you’re applying it on a windy day. Spray sunscreen manufacturers typically recommend holding the bottle 4 to 6 inches from your skin, but Wirecutter found that in order to apply it effectively you may need to spray it even closer, and you still need to rub it into your skin. They’re also easy to accidentally inhale, which poses health risks.
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