Does blotting oily sunscreen reduce SPF?
Emma asks in Gmail…I don’t like the oily skin I get from using sunscreen so I blot off the excess with an oil absorbing sheet. Is this reducing the SPF of the sunscreen?
Yes, blotting some of the sunscreen off your face will reduce the UV protection, to some degree. That happens for two reasons:
First, most UV absorbers are not water soluble so they’re dissolved or dispersed in an oil phase. That means a high percentage of the active ingredient is in th...
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