Excellent sunscreen habits dictate that we reapply sunscreen (boasting SPF 30 or higher) throughout the day. The same applies when wearing a mask. Linkner suggests reapplying SPF every two hours when outdoors in sustained sunlight, including under your mask. If you're inside most of the day, it's less important to continuously reapply SPF. The most important thing is to get a good first coat in the morning. Hale suggests mineral SPF powders or sprays for easy application.
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Any devoted lipstick wearer knows that keeping a lip product on under a mask presents some challenges. The same can be said about sunscreen. Invariably some sunscreen will get absorbed or wiped off on a mask, which is why it's important to reapply sunscreen every few hours. Hale recommends making sure sunscreen is completely dry before putting on a mask.
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