Review on NATIONAL GEOGRAPHIC Earth Science Kit by Christopher Smith

My kids loved it. But, NOTE: 1. The instructions say to wait 1 minute for the patch to harden a little. NOT, regular plaster hardens faster. The waiting time (if any) depends on the speed at which you knead it. My advice: don't wait at all. Once everything is mixed and not too runny (most likely immediately), pour into the mold. Can seep a little at the seams, but that's normal.2. If you want to do an archaeological dig, put some tiny dinosaur toys in the mold immediately after pouring the plaster. The toy must be strong enough to withstand the destruction of the plaster. t is the time during the process.3. Volcanic paint is not waterproof. You might want to colorize or recolor it AFTER running the experiment. There are a lot of color in the kit.4. The powder of the volcano is colored and stains everything the "lava" pours on. Conduct the experiment in a large bowl.