Kneadatite blue/yellow Green Stuff is a room temperature curing, two-part epoxy putty sold in either bar format. Mixing equal parts of the yellow filler and the blue hardener creates a sticky green filler that feels a lot like bubble gum. Once mixed, it has a * of 90 minutes, allowing time for shaping and detailing and achieving "ultimate hardness. after 24 hours. Changing the mixture with more blue or yellow components will produce faster, slower, and harder/softer curing. We recommend using a little lube to prevent Green Stuff from sticking. Water is usually sufficient, but some people also use others such as petroleum jelly, petroleum jelly, or even Johnson baby oil to maintain smooth surfaces. Keep fingers and tools wet for easier modeling and sculpting. You can also add talcum powder to reduce stickiness and prevent fingerprints. - Green Stuff World: Green Stuff Tape 12"