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How to Strengthen Foam

Foam is ideal for constructing theatrical props and costumes because of its low cost, light weight and versatility. Artists can easily shape the substance into any form and cover it with paint or fabric for a realistic look. Foam, though, has the tendency to flake and crack under pressure or with repeated use. To prevent these problems, you can use cheesecloth or water putty to increase foam's durability without adding weight. Water putty is easy to apply but works best for stationary objects. Cheesecloth is more suitable for foam objects that require flexibility.

Things You'll Need

  • 220 grit sandpaper
  • Lightweight spackle
  • Water putty
  • Paint brush
  • 330 grit sandpaper
  • Acrylic paint
  • Cheesecloth
  • Liquid latex, craft glue or flour
  • Gesso surface primer
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Instructions

  1. Water Putty Method

    • 1

      Sand the foam with 220 grit sand paper to create an even surface.

    • 2

      Mix equal amounts spackle and water putty in a bowl or bucket. Add water until the mixture achieves a paint-like consistency.

    • 3

      Paint the mixture over the surface of the foam to fill in crevices and produce a tough outer layer. Allow the mixture to dry for 24 hours.

    • 4

      Lightly sand the foam with 330 grit sandpaper. Paint the foam with acrylic paint as desired.

    Cheesecloth Method

    • 5

      Cut cheesecloth into 1-inch thick strips.

    • 6

      Coat the cheesecloth strips with liquid latex, craft glue or a flour and water paste to make them sticky. For best results, use liquid latex for maximum flexibility on moving areas.

    • 7

      Spread the cheesecloth strips in a single layer over the foam. The dried glue and cheesecloth will create a sturdy surface. For added strength, allow the first layer to dry overnight and add additional layers of cheesecloth as needed.

    • 8

      Sand the final layer after the glue dries, using 330 grit sandpaper. Paint over the cheesecloth as desired, using a gesso primer followed by acrylic paint.

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Sculpture

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