Mix and match is great when it comes to your summer outfits. But mixing sunscreen with makeup is a big no-no. Mixing it with your primer or foundation can reduce its effectiveness drastically and lead to uneven application, leaving parts of your face unprotected and exposed. Keep it simple. Apply sunscreen first, let it sit on your skin for a few minutes and then start your base makeup. You can also opt for foundations with SPF, even though they aren’t known to boost your sunscreen’s effectiveness drastically.