Mixing at 50/50% or 60/40% 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. Altering the mix with a more blue or yellow component will produce a faster/slower and harder/softer cure.
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