Mako, That is what the Strikers have a very hard paint of sorts. That actually scares me. If the paint chips I would think you have a real problem. But like JohnB says, some of these Pacific boats are bare. I have seen similar welded boats they are solid. (I was considering buying a company that builds them for police in another state a couple years back) You must have to have a lot of Zincs in order to get good protection I would think because Zinc is not all that much higher in the valance scale and I would think the coverage of the hull gernerally > 1% of the surfaces area would be needed.
I was sniffing around on the web and foune this cathodic protection thread. (read from the bottom up) Looks like some are using Mg and some are using special AL alloys.
http://www.corrosionsource.com/discu...ML/000124.html