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Extremely clever scientists have been working on sugru for over 5 years to give it as many great physical properties as possible, so it can be as versatile and useful as possible for you. sugru is like modeling clay when you take it from its pack. Once it's exposed to air, it cures to a tough flexible silicone overnight using the moisture in the air. Working time = 30 mins. Cure time = 24hrs (3-5mm deep)