The problem with doing that is if the metal through-hull corrodes enough, it may give way and leave you with two 1" or so holes in the bottom of your boat. Removing the through hulls and glassing over them is really the only truly safe repair.
Originally Posted by mattstamour
My Catalina 25 had the old style unsafe gatevalves on the thru hulls for the sinks. I closed the gate valves, then filled the holes from the outside of the hull with marinetex. The holes were less than an inch in diameter.
Is that unsafe?
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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