1. Clean the concrete garden molds for reusing, spray them with a garden hose.
2. Garden stone molds can be used again right after you pour the first garden stepping stone so you do not have to wait. (Don't wait it 100% dry, or it will be really hard to remove it.)
3. The thick level of concrete can be varying depends on your requirement of garden stepping stones. A wetter mix of concrete for concrete molds is used to get garden stepping stones with ground / lower level, and a stiffer mix of concrete is used to get garden stepping stones with higher / stone level.