Let’s look at some myths and truths regarding sun exposure.
MYTH 1: I don’t have to apply sunscreen on a cloudy day or in winter.
REALITY: Clouds do not protect us from sunrays, as UVB and UVA rays can still pass through the atmosphere on overcast days. As for snow, it can actually increase the intensity of UV rays, as it deflects sunrays.
MYTH 2: There is a significant difference between SPF levels above SPF 15, so an SPF 30 is twice as effective as an SPF 15.
REALITY: There is only little difference between an SPF 15 and an SPF 30, in terms of effectiveness when filtering UVB rays. An SPF 15 blocks 93.3% of UV rays, whereas an SPF 30 blocks 96.6% of UV rays.
NOTE: Unless the product explicitly states on the label that it is a broad-spectrum sunscreen, meaning that it protects against both UVA and UVB rays, the SPF index indicated on a sun protection product only refers to the number of UVB rays blocked.
MYTH 3: A high SPF sunscreen will protect all day long with only one application.
REALITY: All sunscreens must be reapplied regularly, regardless of its SPF, especially after swimming or exercising.
MYTH 4: My makeup contains SPF, so I’m protected when I go sunbathing for extended periods of time..
REALITY: Sun products need to be reapplied regularly when skin is fully exposed to the sun. Therefore, the SPF contained in makeup only offers protection for day-to-day activities, such as driving to and from work, not for extended periods of full exposure to the sun.
MYTH 5: Some sunscreens are waterproof or sweat-proof, therefore they maintain their SPF, even in the water.
REALITY: Waterproof sunscreen will maintain its indicated sun protection effectiveness when in water for up to 80 minutes, after which the SPF value will start to decline. However, water-resistant sunscreen will maintain its indicated sun protection effectiveness when in water for up to 40 minutes, after which the SPF value will start to decline.
MYTH 6: Chemical and mineral sunscreens are the same.
REALITY: While chemical filters absorb sunrays, mineral filters deflect sunrays preventing them from penetrating and damaging the skin. Mineral SPFs are often preferred as they are well tolerated and unlikely to cause any skin irritation.