Bruce in Bangkok wrote in
:

On Wed, 05 Nov 2008 17:00:02 -0600, Geoff Schultz
wrote:

Towards the end of our last trip we noted that the top of a cabinet
had a water stain on it. After much lookng I determined that the
water was leaking through the cored cabintop thru a screw hole onto
the cabinet. Today I pulled out a suspect porthole and found a chip
missing from the epoxy that seals the coring and this was letting
water seep in.

It's fairly obvious that the coring is soaked. How do I go about
drying this out before sealing the leak and replacing porthole?


-- Geoff
www.GeoffSchultz.org

I had a similar problem with a deck and did some research. there seen
to be three basic methods.

One: cut away either the inner or outer skin until you reach dry core.
Remove all wet core, replace core and re-skin. - A proper, expensive
and permanent repair (Note the word EXPENSIVE).

Two: Use some form of heat to dry the soaked core. I read about one
individual who jury-rigged a microwave oven. Removed the door and
bypassed the safety switch. Sat it face down on the deck and plugged
it in. After considerable thinking I rejected that scheme as I
reckoned one might generate sufficient steam to explode the deck.

Three: Bore a number of holes through the outer or inner skin, say one
per square inch, until you reach dry core. Vacuum bag area until core
appears to be dry and fill holes with epoxy putty.

Unfortunately, if you do not completely dry the core you will have
problems in the future and, unless you use method 1 you won't know
whether you solved the problem until the core softens.

In any event, I used method 3 and no evidence of a failed core, so
far.

As an aside: If you completely saturate a plywood core and then seal
it up it will take from 2 - 3 years for the saturated core to turn to
a black mush. Don't bother to ask me how I discovered this bit of
information.

Another point to consider - what type of core do you have? If plywood
or balsa you will need to dry it. If structural foam it is possible
that it is a closed cell foam and cannot absorb moisture.

Bruce-in-Bangkok
(correct Address is bpaige125atgmaildotcom)

I have abalsa core.

I could swear that I read about infusing an alcohol(?) solution which
attracted water and evaporated quickly...

-- Geoff
www.GeoffSchultz.org