I am hearing conflicting information about bottom paint and would like some guidance. I purchased my boat (O'Day 25) at the end of last season and the previous owner told me that each year he sprays the bottom with a garden hose, and then rolls on another coat of anti-fouling paint. I have lost contact with him, but the paint is a powder-blue color, which comes off on your hands very easily. I'm assuming this is an ablative paint. In his Refinishing book, Don Casey suggests this is the best paint choice for a boat that is hauled out each winter, which is the case with my boat. However, when I called the local sailboat shop to ask about purchasing the paint and the application, the owner told me that he had never heard of someone applying new paint over old without scraping, sanding, etc., He said I should be sanding down to bare hull, applying two coats, and then repeating the process every couple years. Most of the hull remains covered with the blue paint now, although there are a few small places where the hull came into contact with the trailer, etc., that I can see the original hull material. Any advice you have would be greatly appreciated.