Made me a mold from polyester of a motorcycle fender (simple one-piece mold)
All the polyester copys are fine (first layer of gelcoat, then the polyester). They do need a bit of sanding before I paint them though.
Ok, now for the carbon part:
After the waxing (same as I use for polyester), the first epoxy went into the mold. After total 3 layers of carbon, the peelply and breather went on + vacuum.
The day after I got it out of the mold. It released easy, there were only a few minor (for this first project then 
) problems on the toplayer.
One of the problems was the missing of a shiny surface. At least, the part that came out of the mold wasn’t that shiny. A piece of carbon+resin that needed to be cut away was nice and shiny. This part was direct between the vacuum bag, no mold, peelply or breather where on it. This little leftover piece was not only shiny, but also a lot stronger, the surface was realy hard. The object that was in the mold wasn’t that hard at all.
The question, is this a problem with the mold or something els?
Could there be not enough epoxy due to the vacuum? (because it’s not so hard)