Gelcoat application


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kornpetpani
kornpetpani
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I've visited a jet-ski factory and I saw that they spray a gelcoat(polyester) on tool surface before  laminating the first layer.

Does anyone know why they need to gelcoat at first ? I thought gelcoat only use for mold making purpose. 

and how is a different between this gelcoat and gelcoat which is used to make a mold ?

Please kindly to help. Discuss
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