On Jul 11, 5:54 pm, Lodewijk Stegman
wrote:
schreef oups.com

On Jul 11, 5:08 pm, Lodewijk Stegman
wrote:
There's not all that much content in your post.

Maybe you should point out your experiences and your engineering.
I meant what I said when I stated that it's almost impossible to use
wood and epoxy together if you don't rely on it's waterproof
qualities.

Why so narrow minded. I use epoxy as an anhesive and sometimes as a
laminating resin, I use paint to protect wood.

Narrow-minded? I have some experience with epoxy too, and I wonder what
makes you so self assured about epoxy not being waterproof.

I am a boat builder, wooden boats at that. And please read Pauls post
above, please.

As far as
'goo's' go, you will have a hard time finding one more waterproof than
epoxy.

And to suggest I said anything different would be innacurate at best.
Although there are many out there I have not used, so I won't guess

Of course everything relative. Glass or steel will be more waterproof
than epoxy, but it is waterproof enough to use it in woodcore boats or
stitch-and-glue boats to make them last for a very long time.

Waterproof "enough". Now you are starting to understand. But maybe not
for the guy who wants to use it to seal a bamboo mast, where is where
this discussion started.


For instance: wood shrinks and swells with changing humidity. Epoxy
won't move with it. How do you engineer that?

Epoxy moves just fine in joints.

It might work with massive wood joints, if the cross-sections are
relatively small.

Not going to take on this one, I don't have the time or inclination.
But trust me, there is much more to that story.

I works better when glueing plywood. The joints last
longest in boats that are designed to be build using epoxy throughout.

Or allow for escape of aquired (not built on wet wood) moisture and
finish with something like paint. And if I am understanding your
assumptions, encapsulated boats should last forever, and they don't.

Do you build such boats?

I do, professionally, have for decades.


In fact it is much more pliable than
polyester,

Cured epoxy can vary in flexibility, depending on the type of hardener
you use. Not every combination works, if you want flexibility.

So you are telling me to use the right mixes for the job. ok I will

Comparing epoxy and polyester when talking about gluing is useless.
Polyester resin sucks as a glue for wood.

I never said anything like that. I said " I use epoxy as an anhesive
and sometimes as a laminating resin, I use paint to protect wood". Are
you my new troll? Rehtorical question, don't bother.


please leave me alone now. I am not here to teach you about
boats.

Maybe I'm here to teach you about epoxy...

Well if elaborating on my posts and making up assertions you wish I
made is teaching, consider me a disgrunteled student.

--
Lodewijk

Apologies to those who suffered through this all.
JW

schreef in
oups.com

On Jul 11, 5:54 pm, Lodewijk Stegman
wrote:

As far as
'goo's' go, you will have a hard time finding one more waterproof
than epoxy.

And to suggest I said anything different would be innacurate at best.
Although there are many out there I have not used, so I won't guess

If I remember correctly you were discussing a use of epoxy and glassfiber
which, save the use of bamboo, was a perfectly normal method to
strengthen and weatherproof a wooden construction.
It was silly to state that epoxy is not waterproof in such a context.
It's waterproof enough.

Of course everything relative. Glass or steel will be more waterproof
than epoxy, but it is waterproof enough to use it in woodcore boats
or stitch-and-glue boats to make them last for a very long time.

Waterproof "enough". Now you are starting to understand. But maybe not
for the guy who wants to use it to seal a bamboo mast, where is where
this discussion started.

Your remark did not specifically relate to the fact that the epoxy was
used on bamboo. You simply said: iet's not waterfroof.
Thousands of boats have been built using epoxy to prove that epoxy is
watertight enough for use on dimensionally stable wood. If the wood had
the right moisture content at the start, the boats won't rot from within,
so why keep stressing that epoxy is not completely, absolutely
waterproof?
Fact is that as long as the epoxy or epoxy-and-glass skin is not
punctured, those boats have an almost infinite life-span. Water-
absorption through an intact epoxy-skin is not a factor.

[epoxy used only for gluing]

It might work with massive wood joints, if the cross-sections are
relatively small.

I works better when glueing plywood. The joints last
longest in boats that are designed to be build using epoxy
throughout.

Or allow for escape of aquired (not built on wet wood) moisture and
finish with something like paint.

Aquired moisture is a factor in the restoration of boats. New boats
should be built of wood with the right moisture content.

And if I am understanding your
assumptions, encapsulated boats should last forever, and they don't.

Encapsulating traditionally built (skin-on-frame) boats is a tricky
business.
Boats that were designed to be built using epoxy can be encapsulated in a
reliable way without any difficulty and can last very long. At least as
long as any polyester boat en with some care as long as any boat.

Comparing epoxy and polyester when talking about gluing is useless.
Polyester resin sucks as a glue for wood.

I never said anything like that. I said " I use epoxy as an anhesive
and sometimes as a laminating resin, I use paint to protect wood".

You at least created the impressing of making that comparison, because
your remark on polyester directly followed your remark on epoxy being
pretty pliable.

--
Lodewijk