Make sure to store the sand in a container with a lid when not in use. Let your child wash his or her hands before and after playing with Magic Elasti Sand slime. The hands should be completely dry when playing with it. It’s best to let your child use a tray so it’s easier to clean up. Wipe your table very well to make sure it’s dry and clean so the fluffy sand could be moulded more effectively. This Magic Elasti Sand is very sensitive to humidity and water and it will lose its silky texture when it becomes wet.