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The first thing that jumps out at me is, since it was on the swim
platform...was there a zinc on the platform supports or a bond to any other
source of zinc? I don't think the platform is protected by zincs on shafts
or the hull unless there is a bond to it....is it a steel hull? Was the
stainless steel bolt submerged?...if so that may be your problem.
Bob Clinkenbeard
24' custom trailer trawler
http://home.bellsouth.net/p/PWP-aboardbobbinalong
----- Original Message -----
From: "Robert Kassal" <>
To: <>
Sent: Saturday, June 02, 2007 2:51 PM
Subject: T&T: Can you over zinc a boat?
> My diver thinks our boat is over zinc'd. This is a 48 foot boat with long
> shafts and it has three zinc's per shaft, one each on the rudders and trim
> tabs. The latter are probably a size too big.
>
> During the barnacle removal, the diver hit a 5/16" SS bolt (that attaches
> a SS
> swim platform support to a SS transom bracket) and it broke at the head.
> The
> post mortem shows a large pit into the bolt right at the head. I know this
> bolt has only been in the water 8 months.Could this be the result of too
> much
> zinc?
>
> Bob
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