Blend the dry materials together until the color is consistent. Break apart any clumps of concrete or throw them out. Cut out the negative space first, like the middle part of the letter O and the P. Cutting them out first will be easier and safer than trying to do it later. The spray adhesive and silicone will leave some texture on the concrete unless you clean it off the base board with denatured alcohol. We can also personalise our round doorstops as gifts for birthdays, weddings, house warmings, funerals and other celebrations. This can make for a very original concrete doorstop present and will make the gifter the favourite child, relative, friend or guest. It can also make gifting a lump of old concrete a much more thoughtful and sensitive thing to do than might normally be the case. Then cut out the rest of the letters, following the traced lines. Leave some room so you can sand it to the exact size.

Use the pencil lines as a guide and press the foam down firmly to the base board. To get the best seal, follow the instructions on the spray adhesive and spray a little bit of foam on the base board too. After the shape is cut out, sand the inside of the foam by hand with 120 or 220 grit sandpaper. The smoother you can sand it, the smoother the sides of the finished concrete piece will be. Spray one side of the foam with spray adhesive, hold the can at least 12" away from the foam because the aerosol can melt the foam. You can also use silicone caulk, which will provide a better seal against bleed out, but takes a few hours to cure. Top off the form with concrete and smooth the top flat with a trowel, always being careful about the foam.Finally, because our doorstops are a highly collectable investment that will only go up in value (much like a crypto, but with upward only wild price swings) we date them so you can show yours was bought before your friend's.