Paint your child hand with gloss acrylic paint and firmly press hand onto the Shrinky Dinks film
Allow to dry completely.
Carefully cut out around the handprint.
Use a sharpie to label the handprint with the name and date if wanted.
Use a hole punch to punch a hole in the top of the Shrinky Dinks film. Don't punch the hole too far away from the side. Use a larger hole punch rather than a smaller one.
Follow instructions on Shrinky Dinks for oven temperature.
Place handprint paint side up on a lined tray and then put into the oven. Watch to make sure the Shrinky Dink doesn't curl. Once the Shrinky Dink flattens, wait 3-5 seconds and then take out of oven.
Allow the plastic to cool before adding key ring, twine, or other hanging device.