Not releasing - probably got it wrong. Help please.

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Not releasing - probably got it wrong. Help please.

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JDUB	JDUB posted 7 Years Ago HOT Topic Details
Group: Forum Members Posts: 10, Visits: 26	Small teardrop shaped plug made of glass and West epoxy. Lots of polyester filler and car spray filler primer to get a good shape and surface. We put on quite a bit of Easy-lease as per instructions, then wax as well. All polished up. Mould made using polyester and glass starting with gel coat and surface tissue. Did not release at all. Took all the paint and filler off the plug Is this to be expected? What should we have done? Small private user. Can't afford complicated systems. Edited 7 Years Ago by JDUB
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Hanaldo	Hanaldo posted 7 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	Yeh you haven't got much choice, there's no real short cuts. If you can't use surface coats that resist the solvents in the gelcoat and heat from the curing of the mould, then you need something that forms a barrier between the two - that's PVA, or wrapping the object in release film or release tape. Those two options will prove much more difficult than PVA. That said, PVA can be sprayed in such a way that it can give you a decent surface finish - certainly as good as a primer finish anyway. You will still need to do a bit of denibbing and polishing of your mould to get a truly Class A finish, but you would have needed to do the same off the primer surface as well.
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JDUB	JDUB posted 7 Years Ago HOT Post Details
Group: Forum Members Posts: 10, Visits: 26	+x Hanaldo - 4/11/2018 4:40:43 AM Yeh you haven't got much choice, there's no real short cuts. If you can't use surface coats that resist the solvents in the gelcoat and heat from the curing of the mould, then you need something that forms a barrier between the two - that's PVA, or wrapping the object in release film or release tape. Those two options will prove much more difficult than PVA. That said, PVA can be sprayed in such a way that it can give you a decent surface finish - certainly as good as a primer finish anyway. You will still need to do a bit of denibbing and polishing of your mould to get a truly Class A finish, but you would have needed to do the same off the primer surface as well. Release film sounds interesting. Searched but not found a product. PTFE perhaps?
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Hanaldo	Hanaldo posted 7 Years Ago HOT Post Details
Group: Forum Members Posts: 2.5K, Visits: 28K	+x JDUB - 4/12/2018 5:28:27 PM +x Hanaldo - 4/11/2018 4:40:43 AM Yeh you haven't got much choice, there's no real short cuts. If you can't use surface coats that resist the solvents in the gelcoat and heat from the curing of the mould, then you need something that forms a barrier between the two - that's PVA, or wrapping the object in release film or release tape. Those two options will prove much more difficult than PVA. That said, PVA can be sprayed in such a way that it can give you a decent surface finish - certainly as good as a primer finish anyway. You will still need to do a bit of denibbing and polishing of your mould to get a truly Class A finish, but you would have needed to do the same off the primer surface as well. Release film sounds interesting. Searched but not found a product. PTFE perhaps? Might be a bit of a misleading title in this context. Release film is intended to go on the reverse side of parts, to prevent vacuum bagging consumables from sticking to the part. A non-perforated release film does leave a high gloss finish, but it is virtually impossible to use as a surface unless you can stretch it quite rightly, as it does wrinkle and crease etc. It can be done if your part is very simple, but if there are any compound curves then forget about it.
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