Hi,

I have searched a lot, but I can't find a clear answer to my case.
I am making moulds for the carbon fiber fenders. The moulds are almost ready and I started to wonder if I need to post cure them? They are made from vinylester gelcoat, and polyester resin with fiberglass. If I need to post cure the moulds, how should I do it and do I need to leave the original fender inside the mould while doing it?

And the same applies to curing the parts. I will make the parts from carbon fiber and epoxy using infusion. How those should be cured? Parts inside the moulds or not? I will use this resin: https://composite24.co.uk/infusion-epoxy-resin-1-5kg

Also, how much resin I need? I am guessing that 1.5 kg/fender?

I'd post-cure it for longer than that. Maybe 2 hours at 80 is ok, but generally at 60 you're looking at 12 hours minimum. The longer the better anyway. Leave it overnight if you can, but make sure that it is supported so that it sits in the correct shape - if it sits crooked and gets post-cured, then the shape will stay that way forever.