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Generally speaking the CS2 is a good firm curing silicone with few inhibitants.
Is there anything different about the two parts you are moulding??
There could be variation in mixing quality, temperature on curing etc that might mean you had been hovering around the threshold for a good cure.
To remedy the problem now, try adding heat and seeing if you can cook off the silicone at around 40-60C. If after several hours there is no improvement then you might have a problem.
Warren Penalver
Easy Composites / Carbon Mods - Technical Support Assistant
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