The Secret Ingredient for Chippy
For a true chippy paint finish, there is no substitute for milk paint.
You have to make sure you're using the POWDERED milk paint. There are some companies that sell "milk paint", but they sell it in a liquid form. That milk paint isn't the same at all, (it's great paint, but it's not going to give you a chippy painted look).
Some of the companies that sell real milk paint are Shackteau Interior Milk Paint (the brand I used for this makeover), Old Barn Milk Paint, Miss Mustard Seed, Sweet Pickins, and Real Milk Paint. They all come in a powdered form and work pretty much the same.
Yeah, you could probably figure out how to get a chippy painted look with other paint, but it's not going to be as easy as using powdered milk paint.