Sunburn protection as a function of sunscreen application thickness differs between high and low SPFs
Photodermatology, Photoimmunology and Photomedicine, 05/04/2012
Liu W et al. – Sunscreen protection is not related in one uniform way to the amount of product applied to human skin. Consumers may achieve an even lower than expected sunburn protection from high sun protection factor (SPF) products than from low SPF sunscreens.