Re: [bolger] Epoxy sealing
Many years ago I built a variation on Glen L's Hunky Dory,
and used her for fishing Herring and Salmon in Western AK.
WEST system was the only stuff available through mail order
in those days, and I followed the book somewhat on
construction. I used the gougeon brothers technique for flow
coating on the inside of the bottom the only part of the
boat that I did this on. I used Fir plywood through out. The
sides , which were not fiberglassed or epoxied, have checked
a lot through the years, but I took a look at the inside of
the bottom planking in Nome this spring, and 18 years later
it is very smooth and unchecked.
HJ
Jeff Blunck wrote:
and used her for fishing Herring and Salmon in Western AK.
WEST system was the only stuff available through mail order
in those days, and I followed the book somewhat on
construction. I used the gougeon brothers technique for flow
coating on the inside of the bottom the only part of the
boat that I did this on. I used Fir plywood through out. The
sides , which were not fiberglassed or epoxied, have checked
a lot through the years, but I took a look at the inside of
the bottom planking in Nome this spring, and 18 years later
it is very smooth and unchecked.
HJ
Jeff Blunck wrote:
>
> My minimal experience on my Frolic says the epoxy is a waste without glass.
>
My minimal experience on my Frolic says the epoxy is a waste without glass.
Where I didn't glass it's checked and opened up to water intrusion. The
paint does a good job of protecting, just like on house siding. If your not
going to use epoxy, there are products for rot protection (borax solution)
that can be coated on to kill the little bugs that cause rot, then painted.
That allows the wood to dry out when on the trailer and not rot. That's the
way wooden boats where protected for decades before epoxy. Some have lasted
a 100 years with good maintenance. George Buehler says to paint a wooden
boat every year if it needs it or not and it will last a lifetime. That
said, it's assumed you have water proof glue in the plywood.
Personally, the above statement in my opinion is for trailerable boats only.
I'd glass and epoxy anything sitting on a mooring or slip for months or
years at a time. But you wouldn't have to with good maintenance and
materials.
Jeff
Where I didn't glass it's checked and opened up to water intrusion. The
paint does a good job of protecting, just like on house siding. If your not
going to use epoxy, there are products for rot protection (borax solution)
that can be coated on to kill the little bugs that cause rot, then painted.
That allows the wood to dry out when on the trailer and not rot. That's the
way wooden boats where protected for decades before epoxy. Some have lasted
a 100 years with good maintenance. George Buehler says to paint a wooden
boat every year if it needs it or not and it will last a lifetime. That
said, it's assumed you have water proof glue in the plywood.
Personally, the above statement in my opinion is for trailerable boats only.
I'd glass and epoxy anything sitting on a mooring or slip for months or
years at a time. But you wouldn't have to with good maintenance and
materials.
Jeff
----- Original Message -----
From: "Stuart Crawford" <scrawford@...>
To: <bolger@yahoogroups.com>
Sent: Thursday, August 23, 2001 6:08 PM
Subject: [bolger] Epoxy sealing
> I was planning on epoxy sealing my Cynthia J before painting,
> however with all the talk about it not being benificial without
> glass, due to checking another thought has occured to me. The
> epoxy sealer is used to completely waterproof the ply wood, so if
> checking occured moisture would be able to get in through the
> cracks, but because the majority of the plywood is still
> completely waterproof due to rest rest of the epoxy, there would
> be no way for the moisture to get out again.
> So my question is. Does epoxy sealing without glass not only not
> make any improvement over straight painting, but actually
> increase the risk of rot?
> Any experience in this regard?
>
> Stuart Crawford
> New Zealand
>
>
>
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> I was planning on epoxy sealing my Cynthia J before painting,My Cynthia J. was epoxy sealed without glass. I had no problem with
> however with all the talk about it not being benificial without
> glass, due to checking another thought has occured to me.
checking on the sides or bottom, but the cabin top checked
extensively and immediately. I think the curvature was a little too
much for the 3/8" fir ply. I never saw any rot anywhere.
One problem that I did have on the sides was due to the fact that the
end grain of the side panel is unprotected at the stem. After it
scraped against a dock, moisture got into the endgrain and raised the
grain in a small area near the bow. I also had a tiny bit of
delamination (easily repaired) in the bottom near one of the bilge
stringers at the transom.
I beached my boat on sand just about every time I used her, but she
was never in the water more than 5 hours at a time.
Peter
You are pretty much correct Stuart, unless the epoxy sheath is
perfectly maintained, and few of us are perfect.
Richard Jagels has written several columns in his Wood Technology
column in Wooden Boat...see issues 123 and 130 among others. I am
also in NZ, and can fax or post copies if you wish to email your
address.
DonB
oink@...,nz
perfectly maintained, and few of us are perfect.
Richard Jagels has written several columns in his Wood Technology
column in Wooden Boat...see issues 123 and 130 among others. I am
also in NZ, and can fax or post copies if you wish to email your
address.
DonB
oink@...,nz
--- In bolger@y..., "Stuart Crawford" <scrawford@p...> wrote:
> I was planning on epoxy sealing my Cynthia J before painting,
> however with all the talk about it not being benificial without
> glass, due to checking another thought has occured to me. The
> epoxy sealer is used to completely waterproof the ply wood, so if
> checking occured moisture would be able to get in through the
> cracks, but because the majority of the plywood is still
> completely waterproof due to rest rest of the epoxy, there would
> be no way for the moisture to get out again.
> So my question is. Does epoxy sealing without glass not only not
> make any improvement over straight painting, but actually
> increase the risk of rot?
> Any experience in this regard?
>
> Stuart Crawford
> New Zealand
Stewart,there are a variety of opinions on this matter. Many sheath
their boats both inside and out in epoxy. This is something that is
not recommended by either T.F. Jones ("Boats to Go") or Dave Carnell.
The reason, I understand, is that epoxy sheathing traps moisture in
the wood and permits rot. These two recommend that at least one side
of the wood be epoxied. Epoxy sheathing, according to these two
gentlemen, adds expense without benefit. Not being an expert, and
having only recently finished Carnell's $200 sailboat, I took Dave's
advice. We shall see how it works out in the long run.
Dennis J. Marshall, Grand Rapids, Michigan
their boats both inside and out in epoxy. This is something that is
not recommended by either T.F. Jones ("Boats to Go") or Dave Carnell.
The reason, I understand, is that epoxy sheathing traps moisture in
the wood and permits rot. These two recommend that at least one side
of the wood be epoxied. Epoxy sheathing, according to these two
gentlemen, adds expense without benefit. Not being an expert, and
having only recently finished Carnell's $200 sailboat, I took Dave's
advice. We shall see how it works out in the long run.
Dennis J. Marshall, Grand Rapids, Michigan
--- In bolger@y..., "Stuart Crawford" <scrawford@p...> wrote:
> I was planning on epoxy sealing my Cynthia J before painting,
> however with all the talk about it not being benificial without
> glass, due to checking another thought has occured to me. The
> epoxy sealer is used to completely waterproof the ply wood, so if
> checking occured moisture would be able to get in through the
> cracks, but because the majority of the plywood is still
> completely waterproof due to rest rest of the epoxy, there would
> be no way for the moisture to get out again.
> So my question is. Does epoxy sealing without glass not only not
> make any improvement over straight painting, but actually
> increase the risk of rot?
> Any experience in this regard?
>
> Stuart Crawford
> New Zealand
I was planning on epoxy sealing my Cynthia J before painting,
however with all the talk about it not being benificial without
glass, due to checking another thought has occured to me. The
epoxy sealer is used to completely waterproof the ply wood, so if
checking occured moisture would be able to get in through the
cracks, but because the majority of the plywood is still
completely waterproof due to rest rest of the epoxy, there would
be no way for the moisture to get out again.
So my question is. Does epoxy sealing without glass not only not
make any improvement over straight painting, but actually
increase the risk of rot?
Any experience in this regard?
Stuart Crawford
New Zealand
however with all the talk about it not being benificial without
glass, due to checking another thought has occured to me. The
epoxy sealer is used to completely waterproof the ply wood, so if
checking occured moisture would be able to get in through the
cracks, but because the majority of the plywood is still
completely waterproof due to rest rest of the epoxy, there would
be no way for the moisture to get out again.
So my question is. Does epoxy sealing without glass not only not
make any improvement over straight painting, but actually
increase the risk of rot?
Any experience in this regard?
Stuart Crawford
New Zealand