Thickness and post curing of high temperature mould


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Dentex
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Hi guys,

I am almost finished with my pattern and I have ordered materials for high temperature mould that will be used for pre preg. I cannot find some answers so I hope you can help me.

First thing is, since I still don't have oven and won't finish it in next 1 or 1 and a half month, can I make mould and post cure it when I finish oven, or I need to post cure it as soon as possible?

My plan was to brush approx. 1mm of gelcoat, brush some resin afterwards and add chopped carbon on sharp angles and reinforce everything with 12 layers of 200g black stuff twill. In total, mould should have thickness around 4-5mm for each part of mould. Is that enough? I am not comfortable using thicker fabrics due to complexity of pattern.

Also, is it maybe possible to "level" some curves with mix of high temp epoxy and milled carbon fiber and pour it as next layer after gelcoat and before fabric? That would greatly reduce amount of work needed for laying fabric reinforcements.
Edited 5 Years Ago by Dentex
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Hanaldo
Hanaldo
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Dentex - 10/4/2020 7:46:45 PM
I can post a picture of pattern so you might have some other toughts if that's ok.

Not to open another thread, is it ok to use high temp epoxy to finish plug and sand + polish it before mould making? 

Will it stick to mould during post curing (not going above 50°C and release agent applied)? 

It is ok in the sense that it will work, but it is not a good idea - epoxy is very difficult to sand and polish, you won't get a great surface from it. Much better off using a conventional 2k coating system, like a 2k primer and then 2k topcoat. If you don't have spray equipment, perhaps look at Preval sprayers. If you really need to brush, then something like EC's Pattern Primer and High Gloss coatings are the only thing I would use.

Feel free to post a photo, would likely help.

GO

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Dentex - 5 Years Ago
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