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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?
I would say so. The marine tex inside the through hull is likely to break up over time due to different freezing/contraction rates or just age. That will again make the gate valves as critical as before...if they are a weak link, which they are, you should get ride of them, either replace with proper seacocks, or remove and properly glass over their openings.
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