How long does it take for SPF 30 to wear off?
How long does it take for SPF 30 to wear off? The bottom line is when you know you'll be outside for longer than usual or when the sun is more intense in your neighbourhood, opt for higher SPF ratings of at least 30 and reapply every 2 hours.
Is SPF 50 overkill?
Properly applied SPF 50 sunscreen blocks 98 percent of UVB rays; SPF 100 blocks 99 percent. When used correctly, sunscreen with SPF values between 30 and 50 offers adequate sunburn protection, even for people most sensitive to sunburn.
What happens if you mix SPF 30 and 50?
But suffice it to say that if you mix sunscreen, the maximum SPF you'll get is the higher of the two you started with, she said. And you'll likely end up diluting it instead. In fact, if the two sunscreens use different active ingredients to protect you from the sun, they could end up compromising one another.