Any home recipe for homemade sunscreen with zinc oxide?

Buy sunscreen. Why take chances with your skin? While zinc oxide is a low-tech but effective sun blocking ingredient, you don't have to spend much to get good sunscreens.
Generic Desitin (zinc oxide diaper cream) Desitin (zinc oxide diaper cream) or diaper rash products like it contain 40% zinc oxide and are similar to the former products that were commonly used in the sixities and seventies but not popular due to their thickness. Modern formulations are micronized making applications easier as less opaque and better tolerated and cosmetically preferable.