Answer to the Halpin family

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Posted by Bengt Blomberg on May 26, 2000 at 16:00:56:

I need to get a couple of things sorted out before I can
give any advise.
1. What I can remember, the Daytonas from these years
were constructed with the cockpit and at least part of
the cabin area as a separate molding fitted into the
hull. It was then common to fill the space between hull
and inside molding with a "closed cell" foam which
theoretically should not absorb moisture.
However the hull hitting the waves at high speed and
the weight of people on the inside cause the foam to
crush. Then it absorbs large amounts of water. Very
often, especially smaller crafts get difficulties to
reach planning due to the weight increase.
Earlier the only possible repair was to open up sufficient
areas of the moulding bottom to remove the foam and
replace it with suitable solid supports. In a yacht with
lots of complicated inside equipment and fittings this
is a very costly form of repair.
Now HYAB has technique to dry the foam filled space from
the outside and create a lasting stabilization of the
crushed foam by injection of a lightweght but strong
mixture of epoxy and microscopic glass beans.
I would need a sketch of the hull with the size of the
inside moulding marked.
If you check the first half of the hull with a moisture
meter you will probably find a clear border were the
readings become lower. That is where the foam filling

2. You mention the hull as stripped. Do you mean that
the gelcoat has been removed?

3. Where is the boat situated?

4. Were there any blisters in the gelcoat?

5. Can you meassure with a litmus paper if there is
acid readings in the hole you have drilled?

Regarding the heating, I recommend to skip both that
and the tenting. It is just a waste of time and money.
Regards Bengt Blomberg

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