How to make it
6 steps. Tap one when it's done.
Paint a rock, write something kind on the back, hide it somewhere public and never find out who found it. That's the whole game and it's better than it sounds.
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Spraying the clear sealer, outdoors, if you want them to survive rain
6 steps. Tap one when it's done.
Acrylic paint is plastic dissolved in water. When the water evaporates the plastic stays behind as a thin skin stuck to the stone, which is why it doesn't rub off once it's dry.
Lake Huron beaches are covered in smooth flat stones that took thousands of years to get that way. Take a few, leave the rest.