Grimas Latex Witch Chin. Foam Latex differs from regular rubber latex in that it involves mixing liquid latex with other chemicals to create a meringue-like foam, which is then injected into molds and baked for several hours. The end result is a soft, skin-like prosthetic that moves with your face and because of it's lightweight properties, it looks different on each person! Simply apply with Grimas Spirit Gum and, if removed carefully with Spirit Gum Remover, the prosthetic can be re-used.