- Lubricant (this is optional) We recommend using cooking spray, or concrete mold release agent
Grease the mold with cooking spray to lubricate it. This helps to release the finished product, and to extend the life of the mold.
Mix the concrete according to the directions on the bag. You will want to add a little water at a time to achieve the right consistency so it is not too runny. You can use mortar mix, port land cement, concrete mix or quikrete. Portland cement can be used for a very smooth lighter colored stone, however it will not be as strong as the Mortar mix which is cement with sand. Concrete mix which is cement, sand and aggregate - small pebbles. Concrete is not as smooth as mortar or cement however it does make a stronger stone.
Fast setting concrete - this is great to use have your pieces ready to de mold in a couple of hours from pouring. We use cement all by Rapid Set, is a wonderful product it works well in all our molds and does fantanstic in our tile molds. This product can be picked up at most Lowes, Home depots or a local building contractor.
Pour mix into bucket or wheelbarrow, add water slowly a little at a time. Scoop out a shovelful and dump it back out on top of the pile. Continue mixing in this manner, adding water a little at a time until the consistancy is dry but not soupy.(Like a thick Brownie batter) A good base might be 5 parts concrete to 1 part water.
Creating your Piece
Filling Mold Start by pouring the mix into the mold and filling about half full, gently shake and tap the sides of the mold to eliminate any bubbles.
For an extra strong garden stepping stone, place a piece of chicken wire, fencing, screening, or hardware cloth in the concrete, and finish filling it. Tap as you go to remove air bubbles.
If you want your stone to be a different color other than the color of the cement see
Adding color to Homemade Stepping Stones
Then finish filling your mold, tap sides again until surface is flat and even. Keep the mold in a dry area to cure for 24 hours on a level surface.
Unmold Stone - Gently Turn the mold upside down onto a soft surface, like grass for example. Tap lightly on the back of the mold. Do not walk on your stones for 2-3 days to make sure the mix has set all the way through.
To make stones faster, you will need more than one mold. Stones remain in the mold untill they have cured, so having more than one mold allows you to make several at the same time.
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