Are you beach bound this weekend? That is, after Hurricane Arthur clears out?

If so, you already know to pack the sunscreen, slather it on (a lot of it, two coats), and reapply after a couple of hours. But here's some more information about why to reapply, which kinds of sunscreens and what SPF are best (and what that means, anyway), and more about the latest developments in sunscreen technology - below.