Originally Posted by
foresthill
As someone who just left Southern AZ after 9 years, I can tell you that this is flat out wrong if you don't live in crazy humid climates like FL.
As someone that currently lives in a crazy humid climate that is FL, I'd still say that it's flat out wrong. You have to reapply the SPF15 and 30 stuff just as often as the 50 or 100; and with some peoples' skin being more sensitive than others, the higher SPF can indeed make a big difference.