After painting the volcano it sat on the kitchen counter for another week or more (Scout camp was the priority) until we finally gathered the supplies listed in the kit and took them outside to make the volcano "explode". We used red food coloring, dish soap, vinegar, and baking soda.
Jake and Viva enjoyed the volcano making kit. Bentley opted out of the entire project. He was too busy collecting rocks and reading about them. If it had been a real volcano, he would have been interested since it would spew out lava that would form into igneous rocks!