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I was under the trailer today, replacing leaf springs when I looked up and saw this:

http://s283.photobucket.com/user/wixo...4.jpg.html


I kitty-haired this keel area a few years ago when I first saw some splits/cracks. Obviously I didn't do a proper job, apparently. This boat only sees water (salt) 5-10 times per season for a few hours, it is trailered all the time.

What is proper procedure to repair?
How much damage might there be?
How to prevent this from happening after repair?

Thank you in advance for assist.

(EDIT: [img] does not work in the discussion area)