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Old 04-21-2009, 02:32 AM   #1
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Hi All

I am looking at a yacht to purchase (hoora ) that has had a big crack (about 30 cm long and 1.5cm wide at the outer edge- that's about 12" x " to the non-metricificated among us) at the leading edge of the keel . The vendors fixed the crack by filling it with 4200 epoxy; is that good enough in theory?

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Old 04-21-2009, 02:58 AM   #2
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It Depends !

What make and model ? Hull material and construction ?

4200 epoxy is not generally used for repairs to hulls - was it not 3M's 5200 ?

If on the hard - might a good idea to get moisture readings off the hull ( below the waterline) every square foot to be read.

The very brief description could very well mean de-lamination has occurred through osmosis, which if that is the case then either get a surveyor or walk away.

Another possible reason could be that the boat was run into something hard which didn't move.
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Old 04-21-2009, 05:25 PM   #3
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Yes, please come back with enough information about the boat that we can be helpful. 3M5200 is commonly used for bedding keels when doing repairs (don't know about when building the boat) and 3M4200 is just a less adhesive version of the 5200. It would seem 5200 is the more appropriate product for the application mentioned. There are other "googes" as well that one might use....

Why is the crack there? what's the backstory? If the boat has been on the hard for a while, you might not get the full picture as it may have dried out completely, btw.

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Old 04-21-2009, 08:34 PM   #4
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She's a 13.5 m, solid GRP, 25 year old Beneteau Idylle. The crack in the attached images is at the leading edge just where the keel joins the hull and the vendor records that 4200 was used for the repair. It seems the crack may have occured when she ran aground at speed onto a sand bank!

keelcrack.jpg
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Old 04-21-2009, 11:48 PM   #5
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Thanks for the info and the picture.

Presume that the boat is on the hard ? If it has dried out all the better for survey purposes as the tests for internal moisture will not be masked by water on the outside.

The possibility of de-lamination as a result of impact damage has to be seriously considered. De-lamination can even occur as result of being badly slung on a lift-out traveler. Once de-lamination has set in - the hull becomes subject to further osmotic processes. Repairing the 'crack' of that size in that area, requires far more surgery than just filling it up with some epoxy compound.

A hull survey combining moisture testing, sounding with a rubber hammer by an experienced technician, IR examination AND if the seller agrees drilling holes (around 1/4" - 6.35mm) along the lowest 12" line -- if de-lamination has occurred , an acidic liquid will be discharged. These holes can be repaired by inserting epoxy plugs.

With the age of the boat and info provided, can only suggest that depending on the value, a qualified surveyor should be instructed.

Also consider that a 25 year old boat may require new rigging - new engine etc etc.
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Old 04-22-2009, 12:09 AM   #6
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Hmm I had wondered if the price was too good to be true... she had been recently re-rigged, re-powered and re-ruddered; sounds like she needs to be re-hulled as well!

Many thanks for your great advice!

...The quest goes on -fortunately/thankfully there are more boats in the sea!
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