You might think that in order to reapply your SPF, you need to take off your makeup and start all over again. But thanks to brush-on SPF, there’s no need: These products (and there are several to choose from) are basically setting powders infused with mineral sunscreen. Most of them are packaged so they dispense through the top of a fluffy brush, so all you have to do to up your sun protection level is gently glide the brush over your skin.