look, we're not here to nag. We all know we're supposed to use sun screen more regularly than we probably do. Instead ofhoundingyou again, we asked experts for tips on skin-cancer prevention and using sunscreen that you're less likely to have heard: the counterintuitive, the new or the little-known, Here's what they told us THE BASICS Hopefully, you've heard these before but let's reapply Depending on your body size, experts recommend using enough lotion to fill a shot glass, 30g, when you're at the beach Even if people are smart enough to apply sunscreen, they may not use enough, said Dr Jerry Brewer, a dermatological surgeon at the Mayo Clinic in Minnesota. Even if the bottle says the lotion is waterproof, beachgoers should reapply after swimming. If you're not swimming, you should reapply every two hours, regardless of the SPE count You should put sunscreen on 15 minutes before exposure. Look for products that are labelled "broad-spectrum protection', with an SPF of 15 to 50. SPOTS YOU'RE LIKELY TO FORGET Dr Elizabeth Hale, a senior vice-president for the Skin Cancer Foundation and a der- matologist in New York City, said that both men and women are likely to miss the tops of their ears and the tops of their feet. Men are particularly likely to miss their scalps and the backs of their necks, while women are more likely to miss their chest and neck areas, she said. Brewer said beachgoers often miss the bottoms of their feet, which can be exposed if they're lying on their stomachs reading or napping.