Green Stuff is a room-temperature curing two-part epoxy putty

Mixing equal parts of the yellow 'filler' and blue 'hardener' produces a sticky green putty that feels a lot like chewed bubble gum. Once mixed, it has a working life of 90 minutes, allowing time for shaping and detailing, reaching 'ultimate hardness' after 24 hours. Altering the mix with more blue or yellow component will produce a faster/slower and harder/softer cure.

We recommend using a little lubricant to prevent Green Stuff from sticking. Normally water is enough, but some people also use others such as Vaseline, petroleum jelly or even Johnson baby oil to get smooth surfaces. Keep fingers and tools wet to make the sculpting and modeling process easier. You may also add talcum powder to reduce the stickiness and avoid fingerprints.