I’m a Cosmetic Chemist Who Just Tested 92 Sunscreens—These Are the Biggest Mistakes I See

The Good Housekeeping Beauty Lab has been testing face and body sunscreens for over a decade. As Senior Chemist, I've led this testing for the past five years, and this summer alone I evaluated 92 sunscreens alongside 766 testers nationwide.

Although spray sunscreen is convenient, years of testing have taught me that many people make common application mistakes that can reduce the protection they get from it. I've made these mistakes myself, and I’ve watched countless beachgoers do the same. Here are the three biggest mistakes people make when applying spray sunscreen, and how to make sure you’re getting the protection you expect.

1. You’re not applying enough

In our studies, we have found that consumers often don’t apply enough to achieve the SPF protection listed on the label. In fact, only about one-third of the recommended amount is typically used. Spray sunscreen can be especially tricky because there’s no easy visual guide, like the one ounce shot-glass amount often recommended for lotion. Don’t just do one quick pass. Instead, follow the American Academy of Dermatology's recommendation to spray generously until your skin glistens, then rub it in.

2. You’re missing spots

Although sprays make it easier to cover larger areas quickly, they’re also easy to apply unevenly. Pay close attention to commonly missed spots like the tops of your feet, the backs of your knees, and your lower back. Avoid applying spray sunscreen in windy conditions, since much of the product can blow away before it reaches your skin. If possible, ask someone to help with hard-to-reach areas like your back, then let the sunscreen dry for about 15 minutes before heading into the sun.

3. You’re not reapplying

Even perfectly applied sunscreen won’t protect you all day. It should actually be reapplied at least every two hours and more frequently if you are swimming, sweating, or towel-drying. If you plan to swim or take a sweaty run, choose a water-resistant sunscreen. The label will indicate whether the sunscreen is water resistant for 40 or 80 minutes. Follow the label's directions for reapplication.

Sunscreens are effective at protecting skin from the sun’s damaging rays and skin cancer, but only when used generously, applied evenly, and reapplied regularly. These simple steps can help ensure you're getting the protection you expect, so you don't discover a missed spot after a day in the sun.