Some paint shops have dyes that work with epoxy resins. If you can find an alcohol based dye, that would work best. Otherwise you can coat the hull with clear epoxy and paint after.
Some advice on which resin to use - don't thin out regular 15-30 minute resin, get finishing resin. Finishing resin works much better because its thin (viscosity) already. If you warm the resin up, it spreads even better. I use this for fiberglassing and sealing the hull. Pacer Z-poxy is what I normally use but Bob Smith Industries makes a good finishing resin also.