Hi Bill that is looking good and at 35 kilo you might want to tie it down so it doesn't float up in the air by itself I would love to see it sail, very interesting design. Does it have centre boards or skegs? Building in carbon fiber is great for keeping weight down but for a one off project it is just not worth it making an outside mould (and above my budget too probably).
I think Catman is right about the two part polyurethane paint being the most durable. If you do spray rember to wear protective clothing and gass-mask because Xylene is very nasty stuff indeed.