Materials + Supplies:
• Rubber Gloves, Safety Glasses, Dust Mask
• 10" Concrete Form Tube
• Shelf Liner
• Spray Adhesive
• 11"x11" Plastic Sheet
• Base Surface
• Duct Tape
• Mixing Containers
• 25 lbs. ShapeCrete
• Hand Saw
• Utility Knife
• Ruler / Square
• Hot Glue Gun
• 100% Silicone Caulk and Caulking Gun
• CHENG Corner and Seam Shaping Tool
• Razor Blade
• Diamond Hand Sanding Pad
Size: 18" x 10"
Color: Grey and Blue
Technique: Hand Packed
A concrete form tube is almost all you need to make this side stool. The finished piece is hollow and weighs about 20-25 lbs. depending on the thickness.
This is the trickiest part of the project, but it's optional. Gluing a plastic shelf liner inside the tube will give the finished piece a texture. The shelf liner here is just over 18" in width, so it fits perfectly inside the 18" tall form tube.
Make the base for the form tube using something flat, like a scrap piece of plywood, or in this case, a terracotta tile that was laying around. Tape a piece of plastic (11"x11") to the tile. The plastic will make it easy to remove from the piece later.
Run a bead of hot glue around the base of the form tube to hold it in place.
This step is also optional, but it will create a nice round-over on the top edge. If you skip this step, the top will have some sharp edges that need to be sanded down with diamond hand pads.
Now the form is ready to pack.
A project this size will take about 25 lbs. of mix, at about 5/8" - 3/4" thick. It helps to mix this amount in a 5-gallon bucket or a concrete mixing tub.
Always wear a rubber gloves, safety glasses, and a dust mask when mixing.
Gradually pack the mix up the walls of the form, turning it as you go along.
If the mix is slumping down, it may be too wet. Try pressing thinner pads into the form and then coming back with a second layer to thicken it up.
When you get to the top of the form, smooth the top edge with a trowel or putty knife.
Cover with plastic and let it cure for 24-48 hours before removing it from the form.
Stripping the form is easy.
Concrete form tubes are really versatile and come in a huge range of sizes so they can be used to make a lot of different (cylindrical) things. The tubes can be packed to form planters, waste bin surrounds, small containers, or short side tables like this project.