I have a 2000 CS 40 with a similar layup including two layers of Vinylester resin. When I bought the
boat after 8 years in
salt water (California and Mexico), the hull was fine but needed a bottom coat. I had it sanded to the
gelcoat, three coats of Interprotect 2000 and 2 coats of Micron Extra. After two years the bottom is still holding up and I don't plan on painting again until next
winter.
Belt and suspenders I always say.