Swetter: Adults need about two to three tablespoons of sunscreen for the body and one teaspoon for the face. If you use a sunscreen spray, be sure to rub it in to your skin to provide an even layer. Avoid spraying directly to the face, which is not a safe practice. Remember that sunscreens are part of a sun protection package that should also include clothing, sunglasses and avoidance of exposure during the peak hours of sun. If your sunscreen isn’t delivering the degree of protection claimed on its label, make sure you are applying enough of it. Consider using a higher SPF formulation (50+) and reapply after swimming or sweating. You can also reapply sunscreen every two hours or so, but once you feel the prickly sensation of a sunburn, using more sunscreen won’t help, and you simply need to get out of the sun.