Nerdy Sidewalk Chalk

We have made sidewalk chalk on numerous occasions. We haven’t done it in awhile, because it is a 10 minute activity, where the finished product isn’t ready for 24 hours. However, summer is a different time than the school year. A 10 minute activity, while a teen waits for their friends to go to the pool, can be just what we are looking for. Before we had done chalk in toilet paper rolls and dixie cups. The finished product is ok, you can go chalk up your sidewalks, but at the end of the day it is a cylinder of chalk. 😦

However, there are tons of silicon ice cube trays with cool nerd culture stuff (You can find more on Amazon). Turns out, teens are pretty excited to make chalk shaped like Stormtroopers, Superman Logos, and a Tardis.

Some notes:

  • Get powdered tempera paint (you can get it pretty cheap from school supply stores).
  • You can follow the directions from the link. However, give each teen a cup of water (about 1/3 of a cup). Then put out bowls of plaster and tell them to add plaster until the have an island of plaster. When mixed, the mixture should look like thick yogurt. Making it not an exact science, means you can just kind of check on people. If you have them measuring exactly, you will need a wet and a dry table and plenty of measuring cups.
  • Remove your chalk from the mold after approximately 30 minutes, then let dry for 24 hours. This way they can take their chalk home with them. Have games and other stuff available for that 30 minute wait.
  • You need to have plenty of molds or limit the number of people. They can make quite a few pieces of chalk with the above mixture.


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