If that doesn't stop them you will have to go to each end of the crack and drill a hole this will end the crack. That's how we do it on naval ships/subs when we run across them.
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Tis better to be quiet and thought a fool than open your mouth and prove it!!
1991 V-20 cuddy I/O 350 volvo duo prop, 1998 15ft Grumman 9.9 Johnson 
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