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Sunscreen is a key preventive tool, however, if you don't use enough or use it incorrectly, it is just not going to work. If used properly, you are leaving yourself open to premature aging (wrinkles and melanin deposits caused by sun exposure) or worse, skin cancer. 

Here're some tips stay safe in the sun:

• Don't Wait Until You're Outside
• SPF needs 20 minutes to sink in before your skin is completely protected from UV rays. If you wait, you might be wearing no sunblock at all for that first half-hour you are outdoors.
• Never Rely on Makeup
• While it may be tempting to skip the sunscreen step in your morning routine when the letters"SPF" are written on every other bottle you're picking up, don't give in. You would need to apply 14 times the amount [of powder] people normally use. The same goes for foundation—unless you want to slather on seven times as much as you would actually use to even your skin tone.
• Keep It Fresh 
• We all have that leftover bottle of sunscreen lurking in the medicine cabinet, but it's critical to start fresh each summer. "The active ingredients in sunscreens can lose their potency, so check the expiration date," says dermatologist David Bank.
• Don't Wear Sunscreen on Cloudy Days
• Seeing clouds in the sky can give you a false sense of security, but the truth is that the sun's UV rays still reach your skin you even when it's overcast. However, researchers found that there are up to 80 percent of UV rays can penetrate the clouds and damage skin.