With an SPF-15, most people are protected, even in summer for about two and a half hours. One should apply sun screen 30 minutes before going outside so that the sun screen is given time to react with your skin. Reapply sun screen when you are in the sun for long periods of time or if your sun screen has washed off. Water resistant products also are available. All farmers are, because their occupation, at a high risk of developing skin cancer however those farm workers with fair skin, light eyes, or who sunburn or freckle easily must take particular care if they are to avoid skin cancer.
Farm workers can protect themselves from skin cancer by Using sun screen year-round.
Look for new clothing material especially designed for blockage of UV rays. Start early with farm kids. Protect your children's delicate skin with sun screen, shade or protective clothing. Watch for the early warning signs of skin cancer. Be aware of any changes in your skin which you can't explain and which last for more than 30 days.