Once the mixture is dough-like, you can start creating your milk plastic tags. You can punch out shapes with a cookie cutter, or simply mold the mixture yourself.
Don't forget to poke a hole with a toothpick and leave it to dry overnight. Then turn it over and let it dry for at least 2 more days to a week depending on the size of your key chain. You will know your tags are completely dried if they are solid hard.