In a small bowl or cup, create the "slime activator" by mixing 2 tsp borax with 1 1/2 cup warm water. Stir until the borax is completely dissolved and then set aside.
Pour glue into a separate bowl. Use the amount based on the amount of slime that you would like to create. I would start with approximately 1 cup and increase accordingly from there.
Add 2 tablespoons of the chalkboard paint to the glue in the bowl and mix thoroughly.
Next slowly add and mix in the slime activator into the glue mixture with a spoon. Stir a small amount into the glue at a time and add more gradually until the glue turns into the slime. Do not rush!
Mix the slime with your hands as the slime consistency thickens.
Use the chalk paint markers to create a design of your choice on the slime. Mix the slime thoroughly together with your hands to erase the design to start over. Enjoy!