On 2008-06-12 09:48:03 -0400, Dave said:

On Thu, 12 Jun 2008 07:10:00 GMT, Jere Lull said:

Hopefully, I also suggested and you used POR-15 first.

I don't recall whether or not you did, but I just ground all the rust off
and used Interprotects's primer wash before applying the barrier coat. Seems
to be holding up pretty well.

Well, you'll probably have a good decade before you have to do it again.

Barrier coats *slow* water and dissolved oxygen down, but nothing stops them.

Next time, I'll bang the big flakes off, leaving light rust, then do
the Zinc-something wash to convert the rust and provide a good POR
bond. Fill, fair, then probably whatever the best barrier coat is at
the time.

--
Jere Lull
Xan-à-Deux -- Tanzer 28 #4 out of Tolchester, MD
Xan's pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI trips & tips: http://homepage.mac.com/jerelull/BVI/

On Tue, 10 Jun 2008 08:59:06 -0700 (PDT), "
wrote:

BTW, the boat is an early J-35 (fully cored), and apparently it had
grounded previously.

Yuck. It looks like the hull failed, not the ballast keel/sump
joint. I suspect the "outsideness" of the ballast was not a
contributing factor.

Yes, J35s had notoriously weak keel attachments. They depended on a
steel plate glassed into the laminate to provide sufficient hull
strength. One hard grounding was usually enough to shatter the
laminate in that area leaving the keel/hull area vulnerable to flexing
or complete failure. I personally know of several boats where this
happened. Repair required almost complete removal of the interior.

On 2008-06-09 20:32:40 -0400, said:

As I discuss in another post, the conventional wisdom is that external
keels are better than internal keels.

Though we have an external (bolted on) keel, I'd say that the above is
ONE conventional wisdom; there are other conventional wisdoms.

Each is a compromise.

--
Jere Lull
Xan-à-Deux -- Tanzer 28 #4 out of Tolchester, MD
Xan's pages: http://web.mac.com/jerelull/iWeb/Xan/
Our BVI trips & tips: http://homepage.mac.com/jerelull/BVI/