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                    A sunscreen’s SPF number is calculated based on how long it would take unprotected skin to burn in the sun. That means a person who turns red after 20 minutes of unprotected sun exposure is theoretically protected 15 times longer if they adequately apply SPF 15. Because a lot of sunscreens wash or sweat off, reapplication every few hours is recommended, no matter what the SPF number.
                    
                        
                        
                    
                    
                        
                    
                        
                    
		    
                    
                
                
            | 14 years ago. Rating: 0 | |
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