What's a clear coat for chalk paint kitchen cabinet s that is durable?

A lot of clear coats can change the look of the finish/yellow over time. For a kitchen, where there might be moisture and/or cleaning involved you might want to consider a marine polyurethane.

Minwax polyurethane.

Take one of the cabinet doors to the paint department of the home improvement store and ask for their advice on paint, stain, and application tools for the most professional finish.,

Hi Mel,

Click on the link below for some more information about various top coats for caulk painted items. It's a pretty long article, but I found it interesting. I hope this helps you. Wishing you the best.

https://www.diybeautify.com/2017/01/top-coat-protection-options-for-chalky-painted-furniture.html