How much sunscreen is enough? ...
Studies have shown that the average person uses significantly less sunscreen than the amount needed to achieve the SPF listed on the label. Don't skimp when putting it on, both in terms of quantity and frequency! Chemical sunscreens should be applied to dry skin at least 15 to 30 minutes before going outside, but physical sunscreens may offer immediate protection. Reapply every 2 hours or as needed. If you're in and out of the water, reapply more often. Sufficient applications to the face, ears, hands and arms are especially important, as these areas are prone to the highest levels of sun exposure. For daily use, a broad-spectrum UVB+UVA sunscreen with SPF of 15 is adequate. For convenience, eliminate an extra step in your skin care regimen by selecting a moisturizer and makeup with sunscreen to encourage everyday use. Keep in mind that the degree of protection provided by a sunscreen depends not only on its concentration, but also on the thickness of application. Therefore, apply sunscreen liberally, evenly and frequently. Based on FDA approved tests, the recommended application of a sunscreen product, that is deemed to be adequate, is to use the thickness of 2mg/cm2 as a guideline.
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