A roughly one ounce (approximately 28 grams) measure is suggested for the application of the sunscreen to cover the entire body, with about a five pence-sized amount for the face alone. With this, it is ensured that the quantity of application provides the protection warranted by the SPF level. For a sunscreen stick, the challenge is that it's very much possible to underestimate how much would be required for covering everything adequately. Each pass of the stick doesn't necessarily equate to a layer of full coverage, and there's a genuine risk of incomplete coverage, particularly along those tricky boundaries, like hairline and eyebrows.
It's crucial to understand that a mere couple of swipes won't suffice for comprehensive coverage. This method of application plays a significant role in determining the efficacy of the sunscreen on the skin. Research on sunscreen usage has indicated that typically a minimum of four applications of the sunscreen stick onto the skin's surface will ensure coverage. However, this cannot be universally applied as it largely depends on the sunscreen's formula and the skin's texture.
To utilise the sunscreen stick correctly, one should apply the stick gently over the skin, in strokes, covering the areas of the skin most exposed such as the forehead, cheeks, nose, and chin. Additionally, do not overlook the often-neglected areas - ears, neck, eye contour and beneath the chin. With each area of application, build up additional coverage. Overlapping strokes are advisable as they ensure that no area will be overlooked while guaranteeing even coverage over the skin.
Stick formulations typically range from drier to thicker consistencies. If the stick feels dry or pulls on the skin, then less product may be transferred, even with multiple applications. Some formulas glide over the skin so effortlessly that ample applications can be achieved in a single stroke. An additional advantage in coverage can be gained from remembering to apply pressure on the skin after each application, aiding the product to absorb and distribute evenly.
It is also of utmost importance to reapply the sunscreen stick every two hours or immediately following swimming or perspiring. The sunscreen stick is water-resistant, but with towel drying or exposure in water, it diminishes more rapidly. The correct reapplication of sunscreen should be deemed as crucial as the initial application. A hasty swipe here and there will not suffice when it comes to maintaining sufficient sun protection throughout the day - you need to apply the stick patiently and meticulously in the same manner as the first time. The same rule applies if individuals opt to use the sunscreen stick for reapplication, after applying a different cream or lotion prior to swimming or venturing outdoors. With this method, you should maximise the effectiveness of your sunscreen stick in shielding your skin from harmful UV rays.