Vsve sunscreen should be replenished every half hour. The chemical components in waterproof sunscreen will be relatively less, which will cause less harm and irritation to the skin, but it will easily float when sweating or touching sunscreen with water, so the actual effect of sunscreen will also be affected.

Sunscreen refers to cosmetics containing sunscreen ingredients. According to international standards, sunscreen cosmetics must be marked with SPF value (SPF is the abbreviation of "sunscreen factor", which is used to describe the protection ability of sunscreen skin care products against ultraviolet rays.