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The issue with silicone is its extremely low surface energy, so you will find the resin will bead up a lot and pool in the low areas, and the carbon won't stay where you put it. You can't use vacuum to hold things in place either so it all tends to result in very poor quality components.
Can work for some things though, depending on the shape. Sometimes a second silicone matched mould can work to hold the carbon in place. In general though, it is not a cheap material and it doesn't work well, hence why it isn't common practise.
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