- apply liberally 15 minutes before sun exposure
- reapply:
     after 45 minutes of swimming or sweating
     immediately after towel drying
     at least every two hours
- 
Sun protection Measures Spending time in the sun increases your risk of skin cancer and early skin aging. To decrease this risk, regularly use a sunscreen with a broad spectrum SPF of 15 or higher and other sun protection measure including:
     limit time in the sun, especially from 10 a.m. – 2 p.m. 
     wear long-sleeve shirts, pants, hats, and sunglasses 
- children under 6 months: Ask a doctor