The spray can is your friend here. What you need is a good base to work from, and this involves putting down several coats of spray primer and rubbing down with fine sandpaper, using some filler if required (to remove scratches etc, use the stuff from a tube) until the surface looks perfect (after a final primer coat). THEN spray on your main colour. Thin coats, let any sags and runs dry fully before flatting down with wet`n`dry 1200 grade paper.
A decent quality masking tape can be used to mask between colours (for the anti-fouling for instance) and you can use pinstripe tape to cover the joint, and most craft of this type have a boot topper.
Using a brush and enamels is much more difficult to get the sort of finish you desire, but it is easy with a spray can.
What have you got to lose by trying???
Ashley