Not so fast – I need time!!!!!! Apply sunscreen 15-30 minutes before you leave the house. That’s how long it takes for UV filters to absorb into skin. The exception is sunscreen with either titanium dioxide or zinc oxide in it, which starts to work as soon as you slather it on.

Keep me in the dark – Exposure to extreme heat can deactivate sunscreen’s ingredients so stash your bottle in a room away from direct sunlight and high temps. At the beach, place it under your towel or in your beach bag. Even better: Keep it in your cooler. When you reapply, you’ll get a refreshing blast!

You need a lot of me – To ensure adequate coverage, use ¼ teaspoon of lotion (about the size of a nickel) on your face and an additional 2 tablespoons (almost enough to fill a shot glass) on the rest of your body. Using a spray? Spritz each body part for five seconds, then rub the sunscreen in.

Yep, there’s an app for that – The intensity of the sun’s rays varies from day to day and hour to hour which is why the EPA puts out a daily UV index forecast. (The higher the index, the greater the need for prote4ction). Get the info on their app. EPA’s SunWise UV index.
Waterproof? Puh-leeze – Simply put, no sunscreen is completely waterproof. “Water resistant” sunscreen protects you for up to 40 minutes in the water, while a “very water resistant” one can last up to 80 minutes. Even so, reapply after toweling off.

Don’t stress too much about my number – A higher SPF equals better coverage, right? Not really. SPF 50 blocks 98 percent of UVB rays, while SPF 30 blocks about 97 percent – not much of a difference. For optimal, protection, don’t go below SPF 30. Reapply about every two hours or after you’ve been sweating or swimming.