1 Assemble the mold. This plywood mold goes together quickly and comes apart easily after the mortar hardens. And you can use it again and again.
2 Spread dry mortar in the form. Fill the plastic-lined form to about 3/4 in. from the top edge with dry Type S mortar. Level it with your gloved hand. It doesn’t have to be perfectly flat.
3 Arrange stones in a pattern. The only rule is to keep the stones close together so they touch and stand up and are not laid flat.
4 Tamp the stones to level the tops. Lay a board across the stones and pound on it with a rubber mallet to embed the stones in the dry mortar and set the tops level with each other.
5 Sprinkle the stone. Adjust your spray wand or sprayer to the finest spray setting and sprinkle water over the completed stepping-stone to wet the mortar.