How often should I reapply sunscreen factor 50 to ensure the sunscreen effect?

Applying sunscreen before going out does not mean that you are done with it once and for all. You must reapply it in time. Today we will see how often you should reapply sunscreen if the SPF is 50.

How often should I apply sun protection factor 50?

After applying sunscreen with an SPF of 50, it is recommended to reapply sunscreen every 2 hours if you continue to be exposed to the sun outdoors. If you stay outdoors occasionally, it is recommended to reapply sunscreen every 3 to 4 hours. In addition, when playing at the beach or swimming pool, you should reapply sunscreen every time you come out of the water, unless the sunscreen you use is waterproof. What brand of sunscreen is good ?

How many hours does SPF 50 protect you from sunburn?

It is uncertain how many hours a SPF of 50 can protect, as it will change due to different factors. Some studies have shown that East Asian skin types will develop erythema after an average of 15 minutes of exposure to the sun. According to theoretical calculations, a sun protection factor of 50 can provide protection for 50*15=750 minutes. However, in reality, the sun protection effect is subject to many factors and cannot provide protection for that long. Ultraviolet intensity, skin type, amount of use, sweating and other factors will affect the sun protection ability.

When is SPF 50 suitable for use?

Sunscreen with an SPF of 50 has very strong sun protection ability and is only suitable for use at seaside beaches and when traveling to tropical areas. It is not needed in daily life or ordinary travel because SPF 50 sunscreen contains a lot of sunscreen, which is corrosive. Too much sunscreen can easily penetrate the skin and cause allergies and other problems, so it is not suitable for frequent use.