About 1 ounce of sunscreen (a “palmful”) should be used to cover the arms, legs, neck, and face of the average adult. For best results, most sunscreens must be reapplied at least every 2 hours and even more often if you are swimming or sweating. Products labeled “waterproof” may provide protection for at least 80 minutes even when you are swimming or sweating. Products that are “water resistant” may provide protection for only 40 minutes. Remember that sunscreen usually rubs off when you towel yourself dry, so you will need to reapply.
Sunless tanning products, such as bronzers and extenders (described below), give skin a golden color. But unlike sunscreens, these products provide very little protection from UV damage.
(Click on our prevention steps for more information)