I've got a tank that I repaired for someone & due to some computer problems (& my own incompetence), I don't know whose's it is. Please PM me so I can get it in the mail to you before I leave for Daytona.
The only carbon tanks that I've done were for race bikes & therefore painted. I just ground the area around the leak, let it dry, & filled it with an epoxy putty. Then just sand & repaint. I did coat the inside of a carbon tank, many years ago, with a home brew of resin & filler & that worked great, but you'd have to make sure that your carbon doesn't have any internal coating on it. The race bike tanks I work with have a foam, anti splash stuff inside, so I've never been able to do a coating on those. If you have the exposed carbon weave, & want it to look the same, you're on your own!
POR-15 is the best stuff I've found for coating the inside of gas tanks, but for reasons I don't understand, they don't recommend using it on carbon tanks. I'm not familiar with the link above, but I'll get some to try out.
I didn't mean to turn this into an advertisment, but since you asked, no pics neccessary, I charge a flat fee of $200 for which I pull any dents, weld and/or braze any areas that need it, fair, prime, & sand the tank to 400 wet so it is ready for paint. I don't paint anymore because I have Hep-C, but I get it so all you have to do is spray.
As long as it's not aluminum, I can fix it, the brand doesn't matter.
PS: my wife has figured out who the original tank belonged to & it now on it's way back to it's rightful owner, but I guess this has turned into a great info commercial anyway. Thanks guys!!