Sun-soaking season is here, and that means that if you don’t lather up with sunscreen, you could be doing serious damage to your skin cells’ DNA, setting yourself up to develop a potentially deadly form of cancer.

it’s important to lather up with some protective sunscreen if you’re going to be spending time in the sun -especially during warmer summer months, when the UV Index rises and the sun becomes more potent.

We enlisted the help of two skin experts to explain just how long sunscreen lasts and how to re-apply it correctly.