Jun 15, 2012
Wear sunscreen every day if you will be outside for more than 20 minutes, even when it's cloudy.
Sunscreen should be applied 15 to
30 minutes before going outdoors and reapplied every two hours or after swimming or sweating.
Don't skimp: One ounce-enough to fill a shot glass-is considered the amount needed to properly cover exposed skin.
Limit your exposure to sunlight from 10 a.m. to 4 p.m. during Daylight Savings Time (9 a.m. to 3 p.m. during Standard Time), which is when the sun's rays are the strongest and most harmful.
When choosing a sunscreen, look for one with an SPF of 15 or higher that provides broad-spectrum coverage against all ultraviolet light wavelengths.
Throw out old bottles of sunscreen, which can lose strength after three years.
Source: American Academy of Dermatology
What SPF Do You Need?
Follow these steps to calculate what SPF you should look for in a sunscreen:
1. Determine how many minutes your bare skin can be exposed to the sun before it burns.
2. Divide that number of minutes into the total number of minutes you want to remain in the sun.
3. The result is the SPF you should look for in a sunscreen.
For example, if your unprotected skin burns in 10 minutes, and you plan on being in the sun for three hours, you would need a sunscreen with an SPF of at least 18 (180 minutes divided by 10 minutes).