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I never heard of a polyester based tooling gel coat. If there is such a thing, it would be very counter effective to use it in this case.
But yes, the procedure is basically the same. Gelcoat, then glass fibres with epoxy resin. But usually you should use woven glass reinforcement, because shopped glass mat doesn't get soft, when used with epoxy resin. Additionally you have to continue after the gelcoat in a fairly small time frame. Unlike polyester gelcoat, epoxy gelcoat doesn't cure to a tacky stage. There is only a window of a few minutes, where the epoxy gelcoat is "half cured". This is the point the reinforcement should be applied.
A good alternative for small parts is epoxy tooling putty.
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