Answer 3 to Halpin fam

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Posted by Bengt Blomberg on June 01, 2000 at 15:43:48:

Hello John!
Then the hull is built just the way it should be and will not cause you any
problems for at least ten years if you just don't apply any coating on the
underwater parts. Just sand the laminate as even as possible, apply a one
component primer and antifouling. The weight increase from water in that small
amount of foam will not make much difference.
If the inner hull starts to move and show cracks or make noises, mark up the foam
area on the outer hull and drill 1/2" holes through it spaced 1' horizontal and
1/2' vertical all over the marked area. Then use a 2' long 3/8" piece of iron and
perforate the foam as much as possible through each hole. Wait until water stops
seeping out of the holes, then blow out as much as possible of the crushed foam
and moisture with an electric hot air gun. The foam does not need to be
absolutely dry. Get a normal filler cartridge gun and a number of empty
cartridges. Buy a normal laminating epoxy resin and silica micro beans (also
called glass beans) and mix to normal filler consistence. Do not use so called
micro ballons. If you cant find the glass beans, use solid silica even if it
becomes a bit heavier.
Mix enough filler at a time to load 4 filler cartridges, that is about what you
can inject into the foam before the filler cures too much. The filler will create
a very strong skeleton in the foam and restore the bond between inner and outer
hull to better than new. Then fill the holes in the hull with the same filler and
seal the holes with pieces of tape. When the filler has cured, remove the tape
and fill after so the surface can be sanded even.
Regards Bengt wrote:

> Hi Bengt,
> I'm thinking you are under the impression that the whole hull is lined
> with foam. But, in fact, the bottom is solid fiberglass with the foam only
> resting on the top of the hull. This is an approx. 2-3' high strip of foam
> encompassing the boat. So when the boat was constructed, we believe that
> it's purpose was for the top section of the boat to rest upon this.When
> drilling through the bottom of the boat to put the transducer in for the
> depth finder, we hole drilled and pulled out the plug and it was
> approximately 3" thick of solid fiberglass - no foam. We are pretty certain
> that there is no foam on the bottom. On the stern end of the hull, instead
> of using wood we believe they used 3" vertical strips of foam every 4' across
> (there are only four of them) across - from the bottom of the hull up over
> the transom. We figured they used these for the fiberglass to adhere to for
> strength. Other than that it is a pure fiberglass core. (in between these
> four strips.) In addition we know for a fact that the 1,050 gallons of fuel
> that this boat carries, is in the center of the boat in the engine room and
> that the fuel tanks are built right into the hull. They take on the shape of
> the hull, and there are no fuel tanks, just a metal plate that sits over the
> fiberglass mould that the fuel is in. Which may account for a high moisture
> reading as the fuel sits on the hull? The moisture meter may be picking up
> the fuel inside the boat? (We are finding out some of these things as we go
> along ...... it has become of great interest to the boaters at the marina
> :-)). Does this change your opinion on this in any way? I must say we are
> most appreciative and have made others aware of your site and your products.
> Thanks, John

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