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Jess8bit
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Ok I'll use wax only for making the next mould, then chem. rel. agent for making the part  I'll post a feedback. Thank you again for sharing your experience CarbonCactus 
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carboncactus
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Jess8bit (26/05/2013)
Ok I only use resin infusion with vaccum bagging. So you would suggest not to use chemical release agent, but only wax because it protects the part and allow to demold as well ? I would use wax to make the mould. Wax fills in little scratches and imperfections. A semi permanent is almost too good at reproducing the surface and will transfer all these imperfections to the mould. Also, wax release will smooth out the yellow wax you use to seal the trim line. For the infusion however, I would use a semi-perm. Don't get me wrong, you can use either for both, but that's how I would do it.
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Jess8bit
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Ok I only use resin infusion with vaccum bagging. So you would suggest not to use chemical release agent, but only wax because it protects the part and allow to demold as well ?
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carboncactus
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Jess8bit (18/05/2013)
Ok, seems the wax is not a popular candidate then  Thank you Chris Jess I use wax all the time for stuff that's not going to cure in the oven. 3 coats, no PVA. I use semi permanents only for prepreg work, they are way too expensive and a waste when not used to their full potential. Don't get me wrong, they work perfectly for this, but its over engineered. If you were using epoxy gelcoat and vac bagging, maybe.
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Leon
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Hello, The best mould making gelcoat ever is Epoxy gelcoat, as we know hard finish, gloss, and Expensive.
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Jess8bit
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Ok, seems the wax is not a popular candidate then Thank you Chris Jess
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carbonfibreworks
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Hi J I use easy lease only and no wax,3 to 4 applications seem to work for me and I make sure the part I am taking the mould from has a very good finish and free of imperfections. Chris
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Jess8bit
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Ok Guys, I definitely was too optimistic, I need too wait much more time than I thought. Thank you so much for your inputs. To make it worse, I might have coated a too thin gel coat layer, indeed. It's quite hard to control the thickness by the way. And would you do this in one or two passes ? About the wax, I must say I followed the guidelines in the bonnet video (severaal layers of chemical agent, then 1-2 layers of model 8 release wax). Was it the wrong way ? or maybe I misunderstood something ? |
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carbonfibreworks
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Jess8bit (17/05/2013)
Hi Chris, thanks for your contribution Yes, I really suspect I did not wait enough. It's about 20° in my workshop. I guess a good 3h30 curing time would not be too much (if I remember well, I waited for 3h). I really hope this is the source of all my concerns, cause that one can be solved pretty easily I will give feedback once I'll have done new moulds. Regards, Jess I leave the tooling gel coat over night and the EC system has worked fine, it is always tempting to try and speed the job up but patience is needed I am the same when it comes to removing parts from the mould but I have leaned to control my excitement . Regards Chris
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carboncactus
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4-6 hours minimum, even overnight. I think you gelcoat might also have been too thin. It needs to be half a mil thick and hard enough so that the CMS doesnt print through. Another note, I would have used release wax only, not a semi permanent, and certainly not both.
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