Liquid PU casting resin over epoxy tooling gel coat for composite mould?


Liquid PU casting resin over epoxy tooling gel coat for composite mould?
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Faberge
Faberge
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Can I pour liquid polyurethane casting resin directly over an epoxy tooling gel coat as a much faster way to make a split composite mould than by building up layers of fibreglass and resin as normal? It is a small mould so cost is not an issue.
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Faberge
Faberge
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Many thanks for taking the time to respond. You are correct about exotherm problems - see my reply to Warren. If you are interested there is a detailed thread about what they call "DIY Corian Moulds" on RCGROUPS.COM. See below.

Abmod
Abmod
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I believe there is a pourable Epoxy made by Devcon

We are trying to avoid the traditional multiple layers of glass here .

I've had great success with resin and sand , ratio of 1 / 5  , very similar to concrete . A bigger mould I just made came out great , super strong and rigid , but heavy .  Next one I will fill same space with foam , it will be poured in 2-3 stages to avoid build up . 

 
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