hello ladies found this article about a girls guide to SPF,since its summer i think this would help us a lot ^_^ keep those skins protected read on~
First things first: How much and how often?
You should use at least a half teaspoon of sunscreen on your face and an ounce (think of how much would fit in a shot glass) on your body. Rub it on all exposed areas of the body until it disappears into your skin. Remember often forgotten parts—the ears, the back of the neck, hands, and legs.
It’s advisable to apply at least thirty minutes before you’re exposed to sunlight and reapply every two hours if you’re staying in the sun—more often if you go in for a dip or play a good round of beach football.
Next, what's with the numbers?
To explain that, we have to begin with the sun: it radiates ultraviolet or UV light, of which there are two kinds which reach the earth—UVA and UVB. Sun block either creates a thin film to filter the UV light or absorbs the rays before they can do any harm.
SPF refers to Sun Protection Factor, which is a measurement of UVB protection. There is no standard system to measure UVA protection, so choose a broad-spectrum sunscreen to protect you from both. Contrary to popular knowledge, the numbers don’t indicate how much time you can spend under the sun. SPF 15 filters roughly 93 percent of UVB rays, and SPF 30 about 97. So it’s more important to reapply every two hours than to get a higher SPF.
Also, whatever the packaging may say, there is no waterproof, sweat-proof, or all-day sunscreen—exposure to water, sweat, or even your beach towel will always lower the effectiveness of your sunscreen, so just take the time to reapply your sunscreen. Also, unless you stay indoors and keep away from windows, you can't completely block out all the sun's rays.
Can I wear makeup with sunscreen?
Being able to wear makeup with your sunscreen depends on how well your makeup and skincare products mix with each other. When exposing yourself to sun and humidity, go for lighter formulas so they don’t melt off your face. Apply products from the thinnest to the thickest consistency, and allow some time in between each product.
You can always opt to use moisturizers with SPF. Also, mineral makeup has some sun protection abilities—but because the amount you apply varies, you should still have a separate sunscreen. Note that there are some sunscreen formulations that may leave a grayish cast on your skin, so make sure to test drive facial sunscreen before committing to a particular product.
more of this on femalenetwork.com