What SPF even stands for.
SPF: “sun protection factor: the effectiveness of suntanning preparations in protecting the skin from the harmful effects of the sun’s ultraviolet radiation, as rated on a scale of increasing protectiveness from
Just because you’re using a higher SPF doesn’t mean you can stay out longer without re-applying.
The higher the SPF, the more run rays it blocks. For example: SPF 15 blocks 93% of UVB rays vs. SPF 30 block 97%. With that being said, you need to reapply at least every two hours in order to make sure you’re getting the protection from the label.
You need to rub in your spray on sunscreen.
Spray sunscreen is great because it is quick and easy. Although, sunscreen works best if it is distributed across the skin as a uniform base layer. Try this: spray two inches from your skin and then spread and rub it in to make sure you cover your entire body.
Sunscreen won’t give you a vitamin D deficiency.
Many pass up sunscreen because of their belief it will prevent the absorption of the suns vitamin D. While it does block it, the laying in the sun isn’t the only way you can get your vitamin D. You can get it walking to get lunch and back or from eating vitamin-enriched foods or supplements.
Always re-apply after getting in the water – no matter how “water-resistant” your sunscreen claims to be.
Even if you just take a quick dip, you’re still washing off a ton of product. Not to mention, water reflects UV rays making it far easier to get sunburned in the water. Ignore the “water-resistant up to 80 minutes” claim. Reapply.