How To Make A Cube Using Foam Board

Foam board is often used to make intricate patterns that would be too hard and time consuming to make with metal framing and drywall or wood. Some people even use it to make some forms of sculpture. This article will guide you through the process of making a cube with foam board.

Decide on Dimensions

Before you can do anything else, you’ll need to know how big of a cube you’re going to want. This is your starting point. Once you know this, you can begin the process of making your cube. You will also need:

    • Foam board to create your cube
    • Drywall saw or very sharp knife, 6 to 8 inches in length
    • Bonding agent like Liquid nails
    • 200 grit sandpaper
    • 400 grit sandpaper

      Creating Your Cube

      1. Glue or bond your foam boards 1 on top of the other until you have your desired dimensions in height of the cube. Use a putty knife to evenly spread the bonding agent.
      2. Allow the bonding agent to fully set and cure. If this step is not followed, the boards will come apart as you attempt the following steps.
      3. Pick one corner to use as your guide corner, and measure out the dimensions of your cube. Use a permanent marker to draw the cube on the foam.
      4. Use the knife or drywall saw to cut along the outside edges of your lines to make create a rough copy of your cube. Cutting along the outsides of the marker lines will give you some room to sand down the roughened edges to your desired dimensions.

      Finishing the Cube

      After creating a rough cube, it’s time to finish it to the exact size desired and fix it.

      1. Using the 200 grit sandpaper on a finishing board, carefully sand the cube down to the desired size. Don’t forget to sand the sides that weren’t cut in order to blend the edges of the foam boards to give the appearance of a single piece of foam.
      2. Using the putty knife, apply a thin layer of the bonding agent along the sides of your cube, 1 side at a time, allowing for complete drying between sides.
      3. Once your bonding agent has fully cured, use the 400 grit sandpaper and the finishing board to bring your cube to the exact desired dimensions and give it a truly finished look.

      After this step, your cube is ready for the final finishing step of either clear coating or painting.