So you’ve purchased a sunscreen and set to go. While choosing the right sunscreen can be crucial, what is paramount is its proper application. Improper application leads to inadequate sun protection. The false sense of security derived by improper application can mislead you in to exposing yourself in sunlight more than necessary, resulting in tanning and sun burns. In this blog, we will look in to the practical aspects of sunscreen application, so that you can derive maximum benefit out of it.
Know your sunscreen:
It goes without saying that the first step is to understand the sunscreen that you’re about to use. The numerous and often confusing terminologies associated with sunscreens are covered in the previous blog. So if you haven’t read it, I recommend you go through it first.
When to apply?
Most sunscreens need to be applied at least 15 minutes before sun exposure. This holds true for all sunscreens that have organic/ chemical filters. This is due to the fact that these filters need some time to get absorbed in the skin and provide maximum protection. Sunscreens containing only inorganic filters can be applied immediately before sun exposure. Applying sunscreen when you’re indoors is advisable if there is indirect exposure through windows or open spaces. And no, you cannot skip your sunscreen on cloudy/ rainy days, as UV rays can penetrate clouds as well. Recent studies have shown that prolonged exposure to light from electronic devices can also contribute to pigmentary problems, so IT professionals are advised to apply a broad-spectrum sunscreen before they sit in front of a screen.
Where to apply?
Ideally, sunscreen needs to be applied on all sites which are not covered by clothes and are exposed to the sun. Some sites which are often missed include the ears, neck, back, legs and feet. Use a lip balm that contains sun filters.
How much to apply?
Studies have shown that most people apply only 20-60% of the amount of sunscreen needed for optimal sun protection. A simple rule which can be followed to know the right amount of sunscreen is the “Teaspoon Rule”. The rule states that for the face, neck and each upper limb (arm, forearm and hand), around 3ml of sunscreen is needed, i.e. slightly more than half a teaspoon (which has a volume of 5 ml). Similarly, for the chest, back and each lower limb (thigh, leg and foot), 6ml of sunscreen is needed, i.e. slightly more than a teaspoon.
How frequently to apply?
Although you are likely to find sunscreens which claim to provide protection for 8 hours or more, the American Academy of Dermatology and FDA advise reapplication every 2 hours. This is due to the fact that your sunscreen tends to migrate towards the hair follicular openings leading to disruption of the sunscreen film on your body. A sunscreen spray or a stick sunscreen can be used to top up every 2 hours. Reapplication is advised immediately after sweating and swimming. A water-resistant sunscreen needs to be reapplied after 40 minutes and a very water-resistant sunscreen needs to be reapplied after 80 minutes of swimming.
So what are you waiting for?! Don’t let the sun ruin your fun!
