I did this technique because the part didn't came well out of the mould... some pinholes and so on!
so the first step for skinning is not in the tutorial but is quit easy to do, just brush some epoxy on the part
wet out your carbon cloth on a paper of plastic and put it nicely on your part... let it cure and add layer by layer of epoxy
with some sanding in between... last step is using clear coat to protect it against UV light and so on
This video was a good help for me 