Modelling clay. Keraplast clay is air-hardened modelling clay that may not be remodelled again after hardening. Prior to modelling, knead the clay thoroughly, and surface finish the product with moistened fingers and let it dry at room temperature. The clay may be used to model figures, shapes, decorations, ornaments, and more. It may be coloured and ornamented after hardening. Unused clay must be perfectly packed in a PE bag, not HDPE bag. The clay is suitable for children 3+.