How to Make Faux Rocks From Spray Foam
Faux rocks have a wide variety of uses. They are used in gardens and planters in horticulture. They are used as props in movie scenes and plays, and are found in exhibits and science-fair projects. Additionally, fake rocks can be used to help learn geology. For example, models can be made of igneous rocks, which are formed from cooled lava.
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Things You'll Need
- Can of spray foam
- Cardboard paper or box
- Sandpaper
- Utility knife
- Putty knife
- Paint
- Paintbrush
Instructions
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1
Place the cardboard paper or box on a flat surface. Spray the foam onto the cardboard. Keep adding foam until the rock is the correct size.
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Smooth and mold the foam with a putty knife, and let it dry. Add more dollops of foam if necessary.
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3
Cut edges and gaps into the foam rock with the utility knife. Smooth the surface with sandpaper. The sandpaper also helps give the foam a more grainy appearance.
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4
Paint the foam so that it will look like a rock. Use combinations of gray and brown paint, with white and black paint to form shadows and highlights.
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References
- Fake Rock University: How to Make Rocks
- Kidipede; Rocks; Dr. Karen Carr
- “Project Railroads You Can Build: From Benchwork to Finished Scenery”; Kent J. Johnson; 2001
