Antifouling has been removed with Carbide Scrapers(shown below)... I have found nothing to be as fast and efficient. Using a cheap scraper doesn't do the work! If you use one of these make sure you grind down the edges so you don't gouge the gelcoat! I get mine from http://www.leevalley.com/wood/page.aspx?c=1&p=20095&cat=1,190,43040,43041.
Starting to fair the hull with a board sander.