Mix 1/3 cup of Plaster of Paris and 1/3 cup of cool water; stir until completely smooth. Mix that with 1 cup of latex paint and stir thoroughly.

Hi Rick! Here is a post from Lowes on how to make DIY chalk finish paint. Hope it helps. :)

https://www.lowes.com/n/how-to/diy-chalk-finish-paint

https://www.hometalk.com/37878819/make-your-own-chalk-paint-recipe

Make Your Own Chalk Paint Recipe

These Chalk paint recipe from Hometalk might be helpful

https://www.hometalk.com/30024176/how-baking-soda-can-change-the-way-you-paint-in-just-5-minutes?expand_all_questions=1

https://www.hometalk.com/4059185/how-to-make-your-own-chalk-paint-recipe-2

https://www.hometalk.com/37878819/make-your-own-chalk-paint-recipe

How Baking Soda Can Change the Way You Paint—in Just 5 Minutes

How to Make Your Own Chalk Paint. Recipe # 2

Make Your Own Chalk Paint Recipe

Hi Rick: Here are a couple of sites that may help:

https://www.dummies.com/home-garden/home-painting/3-ways-to-create-your-own-chalk-paint/

https://salvagedinspirations.com/best-homemade-chalk-paint-recipes/

Hope this helps. Good luck

Here is a great video: https://www.youtube.com/watch?v=O1BlEs07S3c

Calcium Carbonate is the best way to make your own. I shared the recipe I used in this post - https://www.girljustdiy.com/diy-industrial-end-table-makeover/

I used 1/2 c baking soda in a gallon or semi-gloss Kitchen & Bath paint and got good results.

I love the plaster or paris recipe for just one or two projects. But the paint dries out quickly, so you can't store it. I paint furniture all the time with the calcium carbonate powder recipe and flat latex paint.