Why is it possible to get sunburn despite having applied sunscreen?
Possible reasons may include not applying enough sunscreen. You should not apply less than the recommended application amount of 2 mg/cm2 (~35 mg per application). The skin type of the user also plays another important role. If you have a very fair complexion, your sun protection period is only 5 minutes. Sunscreen with a sun protection factor of 20 extends your sun exposure period accordingly, so that fair-skinned people are only protected for about 1 hour and 40 minutes. Sunscreens can also get rubbed off the skin, which limits the protection level.
