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From: Bob & Abby (no email)
Date: Thu Jan 01 2004 - 11:04:35 EST
I completely agree with Andina Foster and can attest to the fact that a
coating of the interior bilge in the form of tar or otherwise will certainly
lead to the demise of a steel hull.
I owned a 1958 Chris Craft Roamer 35', and a 1964 Chris Craft Roamer 56',
also a steel hulled vessel and in both cases the bituminous/tar coating that
Chris Craft originally installed on these vessels eventually caused them to
rust out from the inside out and the damage usually was undetectable because
the coating appeared to be intact while the hull was lost underneath. I
don't know if the coating extended the life of the hull, both were old
boats, but I would rather be able to see the demise and be able to do proper
maintenance as the years passed. In both cases the hull had to be replated
to the waterline on one and to the gunnels on the other.
Chemical preservation of rusting steel hulls is the only way to go in my
book. I was very successful with light and heavy rust using Corroseal
http://www.corroseal.com/ , a rust converter that stops the oxidation and
becomes a primer for almost any coating to be applied over it. I have
experienced positive results with this product and would recommend it to
anyone with a steel boat for small or large areas of rust. It is simple to
use, water based and non toxic.
No connection with the company...but I wish I had the patent!
Bob & Abby
Aboard "Bobbin' Along"
Jacksonville, Florida
Subject: Re: Re[2]: lv-ab: Steel Hulls and concrete
> NO NO NO. I have to respectfully disagree with the comments you received.
> The myths presented are not uncommon but are contradictory to actual
> practice.
>
> The effectiveness of the cement/steel marriage relies on an intimate
contact
> between the cement and the metal and the rust. Once encased in the cement
> there is no moisture migration to perpetuate the rust cancer. Ospho
> neutralizing will preserve chemicals under the rust that the cement can't
> absorb and will continue to migrate, and a coat of hot tar is a recipe for
> disaster by trapping the moisture in a layer that the cement can't reach.
> It will continue to rust under the tar and crack the cement off within a
> year.
>
> Andina Foster,
>
>
>
> > I asked my resident shipbuilder/sailmaker/shipright about this -
> > the reply below is in response to my question "will this work?"
> >
> > LH>
> > LH> Yes, it does work, but bilges must be washed with osphoric acid then
> > LH> baking soda to nutralize. A coat of hot tar helps.
> >
> >
> > Cheers,
> > Corinne
> > Beyond II, under construction in
> > St. John's, Newfoundland
>
>
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