Epoxy gelcoat vs polyster gelcoat


Epoxy gelcoat vs polyster gelcoat
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Hansson43
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Hansson43
posted 5 Years Ago HOT
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Hi, I wonder what’s the difference between epoxy gelcoat and polyester gelcoat ?
I have been working with epoxy gelcoat and epoxy resin for molds but find it rather expensive.
Is it possible to use polyster gelcoat with epoxy resin or do I have to use polyster resin with polyster gelcoat?

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Epoxy gelcoat vs polyster gelcoat
Hansson43 - 5 Years Ago
     epoxy will bond well to polyester - polyester won't bond well to epoxy... that's the first rule you need to keep in mind while working with composites. BUT when you've properly released your mould...
matthieutje65 - 5 Years Ago
     The unimould system uses a vinylester tooling gelcoat. polyester gelcoat often makes problems during demoulding, when using epoxy resins. It can work, but it is not the safest method.
oekmont - 5 Years Ago
             correct about the gelcoat and coupling coat being vinylesters, the tooling resin is polyester if I'm correct in that Uni-mould system.
matthieutje65 - 5 Years Ago
     Thank you! Now I think I get it. So if I have some glasfiber and epoxy left I can use it to make molds with the uni-mold system ?
Hansson43 - 5 Years Ago
     Probably. But definitely not recommend. If you got the unimould system anyways, I would stick to the plan and make the whole mould as intended. Why would you substitute cheap polyester with epoxy,...
oekmont - 5 Years Ago
     Epoxy bonds quite good with cured polyester. The polyester/vinyester gelcoats however are designed to not fully cure at the outside, to give a reactive surface with the backing polyester. As epoxy is...
oekmont - 5 Years Ago
     Thanks good point I haven’t thought about that. I just bought what the guy I’m buying it from said would work. Polyester does it shrink a lot ?
Hansson43 - 5 Years Ago
             Yes polyester has potential to shrink a lot. If you layup parts of your mould too thick they can get super hot (exothermic reaction) and cause voids as well as your gelcoat to pull away from the plug...
JasonFL - 5 Years Ago

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