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@lae
There's carbon and then there's carbon. To be honest I wouldn't recommend those cheap kits, I have thoroughly tested them in the past (testing procedures for wind turbine blade repair... don't ask) and haven't had the best results (lots of delamination i.e. layers peeling apart) as far as I can tell this is due to the epoxy.
I would recommend West System 105 Epoxy with 406 Colloidal Silica filler (best for what you want to do), 200g carbon cloth (I use Cytech; other brands might be fine, don't really know, it's all we can get here). Remember that epoxy doesn't really bond to epoxy very well, so you'll need to do a lot of prep (sanding, cleaning) beforehand - google it.
I'm not trying to put you off - carbon's pretty easy to work with, much easier than most people think, but any repair is only going to be as good as your weakest link, be it materials or technique. Perhaps practice before you go in head first.