Green Stuff is a room-temperature curing two-part epoxy putty sold either in tape format. 

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 worklife of 90 minutes, allowing time for shaping and detailing, reaching 'ultimate hardness' after 24 hours.

Pot life: 90 minutes

Final hardness: 24 hours

To reduce the sticky effect and to facilitate the casting is suitable to wet fingers and tools with water or with vaseline