Cast an entire walkway of these stepping-stones using a variety of materials for the decorative texture of your choice.
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Mark the concrete forming tube 2 inches from one end and carefully saw a ring from the tube. Check the shape of the ring to make sure it forms a circle -- not an oval. Repeat for each stepping-stone you plan to make.
An easy way to mark the tube is to stand a factory end on a flat surface. Rest a permanent marker on a piece (or pieces) of scrap wood cut long enough to raise the marker tip 2 inches above the work surface. Then guide the marker around the tube to create an even line.
Tear off 4-inch-long pieces of duct tape and use them to tape the outside of the tube ring to the blank corrugated sign. Overlap the tape pieces to make sure the concrete won’t leak out. Tape additional rings to the sign as space allows. (You can clean and reuse the sign when you’re finished.)
Wearing eye and breathing protection plus rubber gloves, gradually add water to about 30 pounds of concrete mix (for two stepping-stones at a time) according to the manufacturer’s instructions. When squeezed, a handful of wet concrete should hold its shape but not crumble when pinched.
Adding extra water to the mixture may make it easier to pour it into the mold but will weaken the finished project.
Pour concrete into one of the rings until the mixture extends just above the edge of the ring. Gently shake or bounce the concrete mold as you fill it to force out any air bubbles.
Press the design side of the rubber mat firmly into the top of the form and hold it there. Leave the mat in place for 24 hours before peeling it free; then allow the concrete to cure another 24 hours.
Remove the duct tape from the corrugated sign and pull the stepping-stone away. Use a utility knife to score the ring from edge to edge and peel off the form. Allow the stone to cure an additional 48 hours before using.
Concrete will not stick to the corrugated sign or rubber mat, allowing you to use them to make more stepping-stones. When you’re finished, scrub the mat clean and use it around the house.
For an alternative to the wavy-line texture of the mat shown in the previous section, select one with squares of alternating lines (#320875).
Many objects can be used to create textures, as long as they don’t stick to the concrete. For example, cut lengths of 1/2-inch nylon twisted rope long enough to span the mold ring. Place them side by side on the moist concrete and press them into the surface by hand. Allow them to remain until the concrete cures for one day and then remove.
For a bolder design, select a doormat with a cut-out design (#340340 used here). As with the other mats, allow it to remain pressed into the concrete for 24 hours.
Not all the surface needs to be covered with a design. Here, just a corner of a doormat with a bold design (#297882) was pressed into the concrete.
If you discover a fun, interesting texture for making these stepping stones, share it with other DIYers.