Keel-joint rust
I had a long streak of rust originating at the keel joint,in the bilge area both aft and forward of the bilge.It looked much like the one forward in your photo (at least as it appears).I drilled into there and found a large void between the keeland the hull. Water came out of that void when I drilled into it,right at the rust spot.I cut away the whole area and filled it with solid epoxy.If in fact yours is coming from the same place,feel free to email me.I'm currently underway so use this email address:wiltjerpottery@yahoo.comRusty WiltjerS/V EarthSpinnerHunter 34