Green Stuff is a two-part modelling putty that is useful for filling in gaps on models and sculpting additional details. When the two colours are mixed together, they form a malleable putty that can be applied to plastic, resin and metal miniatures and then moulded into shape using a Citadel Sculpting Tool. Once it has fully cured, Green Stuff is solid enough to glue other components to and can be painted over using Citadel Paints.