Re: Dry out of old hull


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Posted by G. Pariseau on February 14, 2005 at 08:38:04:

In Reply to: Re: Dry out of old hull posted by B.B. on February 14, 2005 at 08:32:34:

Posted by Gilles Pariseau on October 04, 2004 at 15:09:52:
Mr. Bloomberg is there not a " Non Destructive Test " (NDT)available for mesuring pH levels on a boat one does'nt own ?
G. Pariseau


: Posted by B.Blomberg on October 04, 2004 at 12:38:09:
: In Reply to: pH mesurement posted by G. Pariseau on October 03, 2004 at 17:55:28:
: Yes Gilles, you should use the blue type paper strips. If they stay blue or a bit less blue it is O.K. If they become clearly orange or red, don't buy!
: Regards Bengt


: : Posted by G. Pariseau on October 03, 2004 at 17:55:28:
: : How is the pH measured in the10mm holes, if the owner lets me get within 100 metres of his boat with a drill ? Are the paper tabs any use ?
: : Thank you.
: : GillesPariseau

:
: : : Posted by bengt Blomberg on October 02, 2004 at 12:10:29:
: : : In Reply to: Hydrolysis posted by G. Pariseau on October 01, 2004 at 17:56:16:
: : : Hello Sir!
: : : In such an old hull moisture content is not important. It can be at the 10% of the volume level without damaging the laminate if there are no "triggers" to start the hydrolysis process. If there ar no signs of it, it will probably never happen. As a 5% volume moisture already will make all meters go bottom red, that is no way to decide if something dangerous is at hand.
: : : The only way to check such an old hull for eventual hydrolysis problems is to drill some holes into below the middle thickness of the laminate and check the pH level. pH figures above 7 means no hydrolysis. Anything below that means that there is a hydrolysis process going on and if you get figures below 6, just don't buy the boat! Then the repair will cost more than the hull is worth. At figures between 6 and 7 and if the boat is cheap, buy it and you can most probably use it for many years yet without problems as long as you don't follow stupid advises about applying any kind of "watershielding".
: : : Regarding the keel blister, I must know if it is a free lead bulb or a lead filled laminate keel for a proper advise
: : : Regards Bengt

: :
: : : : I am looking to buy a beat up, run down 1973 Morgan 27. filled with 10 cm of rain water for about one year. Can this dry out to to give something usefull ? She has been in dry dock for 7 years and the only blister I saw was on the leaded keel. A blister of about 10 cm dia. by 1.5 cm high, am I talking of hydrolysis here ? Can I just grind this hump down and recoat ?




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