Pb vs. Fe
For the sake of discussion, not argument:I agree with the fact that lead is denser than iron. Gold is dense and doesn't rust, but its not very cost effective! As long as the ballast is the right amount for the boat, it shouldn't make a difference, except that the keel would get larger in size, and some boats have full keels. And the wetted surface is bottom paint, not iron or lead, unless you don't paint your keel, which I wouldn't reccommend. And the prep work (grinding, sanding, fairing, priming, painting) is the same for either. If its done right, there should be no problems with either. And as for small impacts-- its the large ones that get you!