, you may then proceed with filling the molds halfway. They should then be bounced up and down so that the concrete mixture becomes compressed and the air pockets are broken up, which ensures that the base is solid. After this, you may then fill the molds the remaining way. Any excess liquid that rises to the surface during the filling process should not be removed as it assists with hydration. The mold can he be placed on a leveled surface from direct sunlight. They should be covered with plastic to maintain the wetness in the concrete. This is the hydration process that helps in curing the stone. Leave the molds for 24 hours.