I was an early adopter of chalkboard paint and was excited to learn that you can make your own from any latex paint. There are a few recipes out there. Here is the one I use.
1/2 cup of latex paint
1 Tablespoon unsanded tile grout (available at hardware and home stores)
Mix until free of lumps. If it seems overly thick, add a little water. (I often use leftover paint for this, so it does need a little water to work properly.)
It is best to use the paint within a day or two of making it—if it gets clumpy it doesn’t work as well. It also hardens into a brick within weeks. Err on the side of smaller batches for small projects.
To use the paint, roll or brush on in thin, even coats. Sand with 150-grit sandpaper until smooth. It has to be conditioned before use with chalk dust. To condition, rub the surface with the side of a piece of chalk, or brush all over with powdered chalk dust and wipe with a slightly damp cloth. Test the painted surface by writing on it with chalk. If it rips the paint off, you need more coats.
Chalk paint is great for creating versatile Upcycled containers.