The first thing to use the product properly is to choose the right product, ie choose the sunscreen that suits and works best for your skin.
Currently, on the market there are many sunscreens for all skin types, from oily skin, dry skin, acne skin, .. or products that incorporate makeup function, improve skin tone,… There is a detailed article on sunscreen selection, you can check out more.
The second is to clean skin before use
You should wash your hands thoroughly, then make sure the skin on your face is removed from dirt, sweat with cleanser, makeup remover, …
This is an important step to help the cream penetrate quickly into the skin, not bacteria invading, causing acne problems.
Next is the dosage when using sunscreen
You should apply enough sunscreen, not too thin and not too thick is better sun protection. Especially if applied too much is wasteful, making excess cream clogs pores, it is easy to cause acne and fast aging skin.
Use the right time
You should apply sunscreen before about 15-20 minutes so that the nutrients in the cream have time to penetrate the skin, helping the cream to promote its best use.
Need to reapply when in the sun for a long time
Although you have used the best sunscreen, when going out for a long time, exercising a lot or bathing, rubbing, seawater or sweat will wash away the cream, so the skin protection effect will naturally decrease.
So after 2 hours, you should cleanse your skin and apply more sunscreen, for the best protection.
Combined with sunscreen clothing
Sunscreen does not work to keep you from sunstroke and burns, moreover, no matter how high the SPF is, your skin cannot be 100% protected.
So you should still use more sun protection clothes: thick clothes, hats, sunglasses.