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Basically speaking yes, although there might be some problems with the gel coat of your moulds. Polyester mould surfaces have not the best release propertys when using epoxy resin to make the parts. However, if you are using inmould coating or a polyester based clear gelcoat for your parts, there should be no problem. And if you are using pva release agent (wich I do not recommend for most applications) there shouldn't be any issues either. If you however planning on doeing some kind of prepreg process, polyester moulds will likely fail due to the high temperatures.
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