How to Make Colorful Sidewalk Chalk

My kids enjoy playing outside and will often create artwork, holiday messages, and make a hopscotch on our front sidewalk using homemade sidewalk chalk. Making your own sidewalk chalk is easy and you can make only the colors that you need. Once it’s mixed up it will take 1-3 days for the chalk to dry in the silicone molds before you can pop them out and use them.

Adults should be the ones making the chalk but you can do this project with older children that you supervise closely. Plaster of Paris can be dangerous if ingested, so I don’t recommend this project for the little ones. I picked up the Plaster of Paris from my local craft supply store along with silicone soap molds. The Tempra Paint, box of popsicle sticks and zipper closure bags I picked up from our local Dollar Tree store.

How to Make Colorful Sidewalk Chalk

Plaster of Paris
Water
Temepra Paint
Wood Popsicle Sticks or Craft Sticks
Zipper Closure Quart or Gallon Size Bags
Silicone Ice Cube, Chocolate Candy Molds or Soap Molds
Measuring Cup
Measuring Spoons
Scissors

Place 3 cups of Plaster of Paris into a zipper closure bag. Measure out 1 1/2 cups of water using a measuring cup and pour it into the bag. Hold the bag in an upright position and use a popsicle stick to stir everything together. Add 3-4 teaspoons of Temepra Paint. If you want a darker, more vivid color you may need to add more Tempra paint. I find that 3-4 teaspoons works well. Stir up the mixture again. Zip the bag close. Shake things around to make sure everything is mixed well.

Use scissors to cut the corner off of the bag and pipe the solution into your silicone molds. You can fill them so that it’s even with the top of each cavity in the mold. Continue until it’s all used up. Toss bag into the trash. Don’t pour any Plaster of Paris mixture down your drains as it can clog up your pipes. Wipe up any messes with a damp rag and then toss away in the trash.

Repeat the process to make different colors. Lay the molds on a flat surface out of the reach from children and pets. It will take a few days for it to dry. You’ll know it’s done curing because it will look lighter in color and be dry. Once it’s ready…pop out of the silicone molds. Store all sidewalk chalk in an airtight container or zipper closure bag.

When children are using sidewalk chalk they need to be supervised by an adult. Ingestion can be very harmful, so please keep an eye on children who are using it.

Additional Tips: This can be a messy project. Wear an old t-shirt or craft apron. Clean up drips and spills immediately as you go. If you want them to dry faster…have a household fan blow air on them or take them outside to a safe location to dry out in the sunlight and warm air. Toss all disposeable products into a trash bag and dispose of quickly. Don’t pour any Plaster of Paris down your drains. If needed, take things outside and clean-up with a garden hose.

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