Thanks for reply Hanaldo. 

I was afraid that delayed post cure will maybe result in "poorer" performance of already cured resin but if it can be delayed that's great news for me.

I don't know what is considered small but mould would be 35cm ( 14 inches) wide and 130cm long (52 inches). I was considering pouring epoxy with milled carbon because I am afraid that laying up so many layers will have bubbles between that will burst through gelcoat.

Since I plan to make carbon product for sale I can tolerate small imperfections because part will be clear coated but a lot of bubbles would be an issue for sure. Can I run with torch across every layer before adding next one to pop as much bubbles?

1. No problem to delay the post-cure.

2. More than enough for a small carbon/epoxy mould.

3. Yes its an option. I try not to for pre-preg tools, because you end up with a mould with quite varied thicknesses in cross section, which means the mould heats up and cools down unevenly and can cause issues with surface finish and distorting. In reality, it likely wont make a massive difference.

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.