The idea of reapplication might seem intuitive, but we understand that it's easy to push the thought into the back of your mind when you have a full, shimmering face of makeup on. Consider keeping a brush-on, mineral sunscreen — we like the Supergoop! Invincible Setting Powder SPF 45 Beauty ($30) — with you at the actual festival because it won't ruin the beauty look you've spent an hour putting together. Palm suggested using them because they're easy to swipe over your face and scalp, and said to reapply them "every 60 to 99 minutes."