Matt paint is interesting.

I posted something the other day about paint on F1 cars. They are covered in little bumps, like a golf ball, to control the air flow. It will be interesting to see if the matt paint makes a difference and what will happen in the wet.
). Yachting wise, my personal experience says a gloss finish is better. Purely because a sanded finish gives a better surface for weed to grow on, so unless you are dry sailing or diving the boat (before every race) any gains will be quickly lost.