Epoxy gelcoat vs polyster gelcoat

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Epoxy gelcoat vs polyster gelcoat

Epoxy gelcoat vs polyster gelcoat

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Hansson43	H Hansson43 posted 5 Years Ago HOT Topic Details
H Group: Forum Members Posts: 23, Visits: 2.1K	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? Best regards
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Matthieu Libeert	Matthieu Libeert posted 5 Years Ago HOT Post Details
Group: Forum Members Posts: 955, Visits: 3.4K	+x oekmont - 1/8/2019 1:58:25 PM 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. correct about the gelcoat and coupling coat being vinylesters, the tooling resin is polyester if I'm correct in that Uni-mould system. Matthieu Libeert Founder MAT2 Composites X Sports website: www.mat2composites.com
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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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