How to choose sunscreen products? Do you need to reapply sunscreen?

We are exposed to ultraviolet rays every day in our daily lives. If we don’t take good care of sun protection, our skin will be damaged. So how do we choose sunscreen products? How to use sunscreen to achieve the best effect?

How to choose sunscreen products

First of all, the ingredients of sunscreen are the key factors we need to consider. Sunscreen can be divided into two categories according to its ingredients. The first category is physical sunscreen. Physical sunscreens generally contain titanium dioxide or zinc oxide, which can directly reflect ultraviolet rays and have relatively low allergenicity, but they are prone to whitening. The second type is chemical sunscreen. Chemical sunscreens need to be absorbed by the human body to effectively reduce the damage of ultraviolet rays, but they feel very good on the skin and there is no excess greasiness. In addition to being differentiated by texture, sunscreens can also be differentiated by sun protection factor. Generally speaking, spf50 & pa++++ is a high-factor sunscreen, which is very durable and has a good sun protection effect.

How to use sunscreen to achieve the best effect

Generally speaking, apply about a nickel-sized amount to the face, and a nickel-sized amount to the exposed parts of the body. Applying more will add burden to the skin, while applying less will affect the sun protection effect. Before using sunscreen products, it is recommended to apply a small amount on the inside of the wrist for a skin allergy test. Do not use if skin redness, swelling, pain or itching occurs within ten minutes. For people with sensitive skin, it is recommended to choose physical sunscreen products.

Do I need to reapply sunscreen?

It is very necessary to reapply sunscreen every once in a while. However, re-application is not necessary in all cases. Whether re-application is needed should be determined flexibly based on the work and living environment, region, season and climatic conditions. If it is cloudy or in winter in low-latitude areas, the ultraviolet rays are relatively weak; or if your living and working environment is mainly indoors and you are rarely exposed to sunlight, as long as you apply sunscreen in the morning and do not rub the sunscreen film violently, you basically do not need to reapply, and the sun protection ability is enough to meet the needs of daily life.

When to use sunscreen

Sunscreen is generally applied before primer and after lotion and cream. It is used as the last step of skin care. The main function of sunscreen is to prevent ultraviolet rays from sunburning the skin and melanin deposition, thus playing a role in skin care. Sunscreen is most effective when applied about 30 minutes before going out, and should be reapplied every 2-3 hours after going out. After applying sunscreen on the face and limbs, it does not take effect quickly. It takes about half an hour to form a protective film on the human body, which can block ultraviolet rays when you go out.