JUNiORKNET WINDOW CLAY window modelling clay is a creative way to design window decorations! The set contains 12 colours of 35g putty, specially developed to adhere to glass surfaces. Children can create imaginative designs with this modelling clay, whether on windows or other smooth surfaces. The modelling clay is easy to shape and leaves no residue or stains. Once dry, it creates a transparent effect that makes the artwork shine.