I spent the past weekend boating, floating and jet skiing around a lake in picturesque Kentucky. And while it was highly relaxing, a constant question nagged at me as I lolled about in the warm, waterfont sun. Had I applied enough waterproof SPF 45 sunscreen to ward off those vicious UV rays? Or was I a sitting duck in water, just asking for a blistering burn?
Not wishing to ruin my getaway weekend by scorching my skin in the sun, I reapplied lotion like a maniac. And while I managed to dodge any significant sunburn, the experience made me wonder just how often you’re supposed to reapply.
Don’t wait until you notice your skin turning pink; by then, the damage is already done. You should put on sunscreen 30 minutes before even stepping outside to give the lotion time to soak into the skin. The Canadian Dermatology Association advises reapplying sunscreen 20 minutes after initial sun exposure for added protection. From there, the general rule of thumb is reapplying every two hours.
But if you’re swimming, sweating or toweling off frequently, the two-hour guideline won’t cut it. To stay adequately protected, reapply every 15 to 30 minutes or immediately after getting out the water. Keep in mind that the sun’s rays are also strongest during prime swimming hours between 10 a.m. and 4 p.m.
Slathering on SPF 50 doesn’t provide some kind of ironclad protection, either. The Skin Cancer Foundation states that SPF 15 sunscreens generally filter out about 93 percent of UVB rays, while SPF 30 blocks 97 percent and SPF 50 blocks 98 percent. Also, don’t ditch the sunscreen on hazy days since 70 to 80 percent of the sun’s rays penetrate clouds and fog.
So it turns out that I wasn’t maniacal about putting on sunscreen after all. No matter if skies are overcast or if sunscreen boasts a sky-high SPF, you should keep on a fresh coat if you want to guard your skin from sun damage.