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Old 06-01-2016, 10:05 PM   #21
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Looking good!
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http://thepromiserwb1029.org/2012/09...the-promise-2/
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Old 06-11-2016, 08:38 AM   #22
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Story of our intended to be a quick bottom job prior to this years boating season still doesn't come to an end although it takes up to now 3 month:
Yesterday she was craned back to the wet element. After some minutes I noticed some water in the bilge. Checked the stuffing boxes and had to adjust one. Pumped out the bilge and made a round to inspect all seacocks. And identified water drainage at the depth sounder, the log and one seacock just beside the two sensors. All located mid ships close to the keel. Obviously the sand blasting guy did not take appropriate caution in that area (to do so one must crawl on elbows and knees under the hull so it is very likely that he didn't do that) and damaged the outer seal of the through hull fittings.
Unfortunately the crane had already left the yard. My estimate was that the drainage would some up to some 20 liter per day, so not really something to be fundamentally scared about. But no idea how this drainage would develop if the hull starts to "work" in the sea. Since we finally wanted to start the boating season the yard suggested to apply "Leak Hero". It is advertised as a magic sealant wax working even if applied under water.
We tried and failed. Water pressure seems to be too high, draining water built up bubbles under the wax and finally the previous drainage rate reestablished. So I advised the yard to reorder a crane and get that job done on their own expense.
This time it won't cost my money but it will certainly cost me additional time of the boating season to be spent in the garden ...



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Old 06-11-2016, 10:52 AM   #23
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That is disappointing. Sorry to hear it.
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Old 06-11-2016, 12:12 PM   #24
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Hard to imagine sand or any other kind of blasting disturbing a good seal under a thru hull.

Often a well sealed one has to be sledge pounded, heated, or fine wire cut and it is still a sruggle to get out.

Either way...ensure they are reinstalled correctly....

Usually if they don't leak right after reinstalling and caulking correctly...they won't.
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Old 06-11-2016, 12:40 PM   #25
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Quote:
Originally Posted by psneeld View Post
Hard to imagine sand or any other kind of blasting disturbing a good seal under a thru hull.

Agree. But they were bone dry before the bottom job.


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Old 06-11-2016, 12:44 PM   #26
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Quote:
Originally Posted by waddenkruiser View Post
Agree. But they were bone dry before the bottom job.


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Only thing I can think of is..... the sealant was imperfect and the ring of extra sealant around the lip of the thru-hull and or paint was sealing it till it was blasted off or disturbed.
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Old 06-11-2016, 01:04 PM   #27
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AMS 40' bottom job

All thru hulls have been renewed during a refit ten years ago (so documented by the PO). With the exception of the three now failed all others are tight and seem to be in good shape. Should add them to the list for next haul.


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Old 06-18-2016, 04:27 AM   #28
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AMS 40' bottom job

Story continues. Yard sent me pics claiming that the thru hulls were likely to fail since outer sealant seems to be applied on AF. Would be in line with psneelds statement above.
Due to business obligations I wasn't able to have a look on it, only these pics. Personally never saw a disassembled thru hull so I'm unsure in the interpretation of the pics.
Want to achieve a fair cost agreement with the yard. Meaning it has to be fair for both of us - a good job has to be payed accordingly IMO.
Therefore my question: Pics might show old anti fouling or rests of a sealant paste?
What is your opinion?
(The other thru hulls are already on the list for next haul)
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Old 06-18-2016, 04:38 AM   #29
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Want to add: All thru hulls have been renewed ten years ago by a reputable yard specialized on sea going yachts and small commercials.


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Old 06-19-2016, 02:43 PM   #30
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Would appreciate any of your wise opinion on the pics above:
Do we see rests of old anti fouling or rests of a sealant paste?
I would like to believe the second. Otherwise I would have to conclude that craftsmanship is on a bad way ...


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Old 06-19-2016, 03:00 PM   #31
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My opinion is that you should not be able to "create" a leak in a properly bedded through hull by sanding, sandblasting, or otherwise disturbing the hull around the through hull.

The fact that you now have a leak is more symptomatic of a through hull that was marginally sealed than of any poor workmanship by the yard doing your bottom job.
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Old 06-19-2016, 03:36 PM   #32
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You made a good point. Either the job ten years ago was done with bad quality by the reputable yard which worked on POs expense or the subcontractor of my yard now failed. I'm interested in a longterm relationship to a yard working on reliable quality level. From that perspective ...
Lessons learnt might be: Don't rely on reported reputation. Stay with the locals.


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