I’ve been wanting to play with concrete, and I thought a two-tone concrete letter would look awesome sitting on my shelf. My concrete letter didn’t turn out quite right, because I was impatient. I picked up the mold before the allotted drying time was up, because I wanted to see if the concrete was still wet. It was, and it cracked into 3 pieces. Oops. The good news is that I just need to get some landscape block adhesive to glue the pieces together, and no one will ever know (well, except you guys).
hollow cardboard letter (available at your local craft store)
breathing mask (or something to cover your nose so you don’t breath concrete dust)
two plastic spoons
two disposable plastic bowls
a disposable cup
Lay the letter face down and cut out the top side to make the mold. (The facedown side of the letter will be the front, so make sure if you’re using an asymmetrical letter that it won’t end up backwards.) Remove the cardboard filler inside, and use a piece to divide the letter mold in half diagonally. The divider should fit snuggly against the edges of the letter.
Next, mix the concrete wearing gloves and a breathing mask (do it outside so you don’t get concrete dust in your home). Mix a bowl of plain concrete and a bowl of colored concrete. For the colored concrete, premix the dye and water in a disposable cup before stirring it into the concrete mix. I didn’t measure anything. I just mixed in enough water to get all the concrete wet and then stirred in a little bit more. It should be thick and not at all runny.
Once the concrete is mixed, work quickly to spoon one of the colors into the mold. Wear gloves and pack the concrete into all the edges and corners with your finger tips. Remove the divider and spoon the second shade of concrete right up against the first. Smoosh them together firmly. Fill in the rest of the letter making sure to push the concrete down into all the crevices.
Now, don’t pull on the cardboard to peek, don’t move it, and don’t even touch it! Let it sit for 24 hours before cutting away the cardboard mold.