I recently went to Maui and we were out at the pool area for a few hours. I was lying on my back and applied the MultiVitamin BodyBlock SPF20 to the front of my body. After a while, we went to a shaded area. As we were sitting there eating, the sun moved and I proceeded to get a sun burn on my back. When I looked in the mirror later, I had a perfect hand print where the sun screen stopped over my right shoulder. The MultiVitamin BodyBlock SPF20 worked great, but only where I applied it!