Yes, you can just scrape and sand the areas where the
paint is loose and only repaint there. But do you know how many coats of ablative the previous owner applied? I tend to agree with the advice to
paint the whole bottom, mainly to be sure you have enough
paint to last the whole season. Ablatives are made to wear away during the season, which I like since you don''t get a buildup of coats.
As for weekly hull cleanings -- are you racing every week? If not, weekly cleaning is overkill and yes, will hasten the demise of the ablative
paint. If you''re just a cruiser, try monthly cleanings and see what happens. Personally, I usually have my boat hauled in early August for a quick powerspray and then relaunched immediately. That one time does it for me -- but I cruise.
As for type of
paint, I''m a big fan of ablatives. No buildup of coats of
paint to remove at some point down the road (at great expense or at least great aggrevation.) I use Pettis Ultima SR, which has a biocide in it to hold down slime growth. Works well, too. But if you do want weekly hull cleanings by a diver, the Trinidad would be better. I sail on the Chesapeake BTW since some
paints work better in some areas than others.
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