Mustela’s SPF 50 Mineral Sunscreen Stick is easy to apply. About 15 minutes before you head outside, remove the lid and apply the product directly to your or your child’s face and body. For complete coverage, apply the sunscreen liberally, being careful not to get it into the eyes or mouth. You’ll need to reapply sunscreen at least every 2 hours. If you’re swimming or sweating a lot, reapply after 80 minutes. Consider setting a timer to help remind you.