Join Date: Apr 2006
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Re: Thru hull possibly leaking... what to do
With a 21' boat, it is possible that you can either careen the boat, or take a line from the masthead to a dock/shore fitting and haul it over sideways, so that you can lift one side of the hull pretty much clear of the water, at a time. That would allow you to remove and rebed one side, and then come back to do the other. And removed and rebedding is really the right way to go. "Do once and do it right" instead of patching and kludging. And, if the big white nut splits....uh, yeah, you're going to need to do something like that real fast anyway.
If there's any type of crane or an overhanging dock structure, you may also be able to tie a line around the read of the hull and simply lift the rear clear of the water. Hauling isn't the only option, although for 21' you may be able to have a local marina give you an overnight haul, i.e. they haul you last thing in the day, leave you in the sling, launch you again in the morning and that gives you a few hours between the haul and sunset when you can do a fast job.
A PITA but something that can be done. I used 5200 to replace a speed log throughhull once. The previous one had been put in the same way. Didn't matter, the new one was larger than the old one, would require a large hole to be drilled. The old fitting was easily split with a saw and then imploded into the hole. The 5200 was practically the same as the frp of the hull, which doesn't seem to bad for what is intended to be a permanent installation.