Art preservation
Maybe you are not a famous chalk artist. But this knowledge may come in handy someday if you would like to try to have a go at it. You can help waterproof your chalk drawings with WD-40. This way, your decorations will last more than a rainy day.
Contrary to crayons, when you spray it on chalk, it will help make it last longer against outdoor conditions. Now, all you have to do is buy some chalks, watch some online tutorials, and you are good to go; you already have WD-40. We wish you good luck!