When using epoxy or polyester for molds ?

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Zorongo	Zorongo posted 10 Years Ago HOT Topic Details
Group: Forum Members Posts: 40, Visits: 330	Hi all. I'm making small size epoxy parts, but sometimes I've made them whith polyester. Room temperature curing, hand lay up with small presure over the laminate (counter mold) I had demolding problems with a polyester mold and someone told me a "rule of thumb": Use polyester molds for polyester parts and epoxy molds for epoxy parts. (I'm actualy using PE molds for epoxy parts without any problem) So, the question is: Whe should I use epoxy molds ? An epoxy mold seems to be better fron the dimensional stability point of view.. It also seems logical to make the molld similar to the part if high temp increases are expected (prepregs, exotherms ?) to reach a similar diatation / contraction on both and avoiding stresses.... Could you please share your experience ? Thanks in advance
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Jacopo Carbonio	Jacopo Carbonio posted 10 Years Ago HOT Post Details
Group: Forum Members Posts: 43, Visits: 109	I usually use pva without wax on my polyester mould.. Before laying cf I brush a layer of epoxy gelcoat transparent (this is the reason why I don't use wax).. Sometimes I have problems with demoulding because of the shape (it sticks a little).. With chemical release or similar will be better?
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Zorongo - 10 Years Ago

biker_kev - 10 Years Ago

matthieutje65 - 10 Years Ago

baja_patient - 10 Years Ago

Zorongo - 10 Years Ago

Warren (Staff) - 10 Years Ago

OK, thanks all ! :)

Zorongo - 10 Years Ago

kidpaint - 10 Years Ago

matthieutje65 - 10 Years Ago

fgayford - 10 Years Ago

Jacopo Carbonio - 10 Years Ago

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