First polishing and then spraying paint is not a good idea.
I think your hulls need new painting after 24 year!
So first sanding, cleaning and decreasing and then one or two layers D.D. paint (Poly Service, Amsterdam or Nieuwekerk aan de IJssel).
Succes met die klus
hey boy, what did you do over there, alone far out at sea?..
"huh....., that's the only place where I'm happy, sir.