Hi, I have put some pictures he
www.photobucket.com/
Search for images named "sabina113"

I find when I take the yacht out of the water each year I have bubbles
in the paint mainly where things have been welded to the inside of the
hull. The bubbles are filled with salt water which is quite strong and
possibly acidy. When the bubbles are opened there is very clean steel
underneath. It doesn't seemed to have corroded the steet alot. The
zincs last a year ok.
I guess this is some sort of electrosis or stray current erosion but
was hopeing for a second opinion.
Also, if anyone looks at the pictures, have you seen a driveshaft
thrust bearing setup like in the picture. There is a small brass bung
on top where the thrust bearing is. Do you put oil in there?
Thanks
asdex