Don't mix sunscreen with moisturizer.

No. You’re diluting the SPF and messing with the chemistry. Sunscreen is tested at a specific concentration and formula—mixing it with anything breaks that. You get less protection, and there’s no way to know how much less.

If application is the issue, try a moisturizer with SPF built in. Those are formulated together and tested as a single product. Or apply sunscreen first, let it dry, then moisturizer on top. It’s one extra step, but your skin won’t get crispy.

Not worth the shortcut.