Hi - 

I have a seasoned carbon fiber mould (picture attached below) that I've used for several resin infusion skateboards.  Currently there are spots of carbon fiber showing through.  From the start, I never put a layer of gelcoat or primer on it, but instead only applied wet lay up epoxy and mould release + pva film to release the part.  I built up the mould on some XPS shaped foam with wet layup. Now I've got it back to a smooth surface with some 320 grit sand paper.  What's the best way to get this back to a perfect finish for a mould?  Is it possible through infusion vs. painting?

Thanks - 

Not good situation. Try to paint it with epoxy as many times as needed (mold will for sure consume the resin) and then trim the resin and polish it


Carbon fiber sheets and composites .
www.dexcraft.com

If you can get Duratec Sunshield where you are, that is made for resurfacing moulds so perfect for what you need. Can be applied by brush, but to be honest if you can't spray then you're much better off remaking the mould.