Do I have to apply sunscreen again after swimming even though the sunscreen is waterresistant?
The waterresistant test basis for Eucerin® Sun Protection products is geared toward the American FDA test standards. The protective product is applied to the underarm of a test person, and then the arm is held under water in a whirlpool for two intervals of 20 minutes each. Afterwards, the applied product on the underarm must still indicate 50% of the original protection level. However, the waterresistant test provides no information regarding the product’s resistance to friction. Friction, such as drying off, sand contact, wind, causes up to 80% of the sun protection product to rub off onto a towel or to disappear. After swimming and drying off, you have to re-apply sunscreen, even waterresistant sun protection products. UV protection in and on the water is of particular importance because the water lets UV radiation pass through and its reflection increases its intensity. Especially during beach holidays, make sure to reapply sunscreen more often than the SPF would indicate. As soon
