How often should sunscreen be reapplied

How often should sunscreen be reapplied in the end? Is it true that the higher the sunscreen index, the longer the interval? The answer is no. The high sun protection index only means that the sunscreen has a strong ability to block ultraviolet rays, SPF50 sunscreen can block 98% of UVB, SPF20 sunscreen can only block 95% of UVB.

Sunscreen reapplication interval, and formulation, sweat and sebum secretion, friction strength and many other factors, in general, the sunscreen protection ability can maintain 2, more than 2 hours, the protection ability will be reduced. Therefore, the best interval for sunscreen reapplication is 2 hours, especially in a hot outdoor environment.