Gypsona Plaster Bandages remain the industry standard for making a fast, strong support shell specially in lifecasting applications. Gypsona Bandages are immersed in water and layered over cured Body Double, Body Double™ SILK silicone mold rubber or Alja-Safe™ Acrobat alginate. The bandages dry and form a rigid support shell (or “mother mold”) that holds the rubber mold in shape during the casting process.