"Andrew Butchart" wrote in message
. ..
For my current project - a Stevenson's Weekender - I'm very close to being
able to put on the sides. To avoid crawling around inside the boat
coating
and painting, I'm wondering about doing that before I put the sides on.
I'll mask off where the glue joints will be during a trial fit. The sides
will be 1/4" luan coated with polyester resin (no fiberglass on the
inside).
I'll fiberglass the outside after assembly.

My concern is whether the resin will be able to take the bending after it
sets up, or will it crack? Has anyone else tried to do things this way?
I
don't really want to crawl around inside the cabin breathing in fumes
trying
to do the coating.

DON'T!!!

Polyster will fall off. It does not stick to wood well, the slightest stress
will separate it from the wood. Use epoxy.
I once made a mistake to join two pieces of wood with poly/glass. It dit not
hold, I could peel it off clean. You will NEVER be able to peel off
epoxy/glass without tearing wood fibres.

Meindert

Meindert Sprang wrote:

DON'T!!!

Polyster will fall off. It does not stick to wood well, the slightest stress
will separate it from the wood. Use epoxy.
I once made a mistake to join two pieces of wood with poly/glass. It dit not
hold, I could peel it off clean. You will NEVER be able to peel off
epoxy/glass without tearing wood fibres.

Meindert

Thank you everyone for your input. I will probably ignore the advise
to throw away my remaining resin and spend 3 times as much for epoxy
and run the chances of developing an alergic reaction. PLEASE - the
whole polyester vs epoxy controversy has been done to death. I know -
I've been part of it on this forum for years. I had hoped that this
thread wouldn't re-ignite it but it seems that it has. I went into the
project fully aware of the impact of my materials choices.

I will however plan on putting the panels in place before coating them
- reducing the chances of resin failure.

Andrew Butchart

Andy,

I'm sorry if 'we' wasted your time. Especially if you already knew the
answer !!

The entire discourse could have either been avoided, or taken a different
tack, if you had mentioned this fact . . . up front.

As an engineer {and a C.P.A. - 'Certified Pain in the Ass' per my wife} my
first thought, when someone ASKS ME a question, is that they want an
accurate & correct answer. It has taken me YEARS to realize that they
actually DON'T. Therefore I have adopted the 'policy' of . . . 'If you don't
like the answer . . . DON'T ASK the question !!'

Regards & Good Luck,
Ron Magen
Backyard Boatshop

wrote in message

Thank you everyone for your input. I will probably ignore the advise . .
..
SNIP
I went into the project fully aware of the impact of my materials choices.
SNIP
Andrew Butchart

Ron Magen wrote:
Andy,

I'm sorry if 'we' wasted your time. Especially if you already knew the
answer !!

The entire discourse could have either been avoided, or taken a different
tack, if you had mentioned this fact . . . up front.

snip


Sorry about the confusion. I had thought that my question was about
whether a coated 1/4" panel could be safely curved around the hull or
whether it would be too stiff or brittle. I didn't think that my
choice of resin was part of the question although I did mention it
because it was pertinent. I did sort of get an answer in that with the
poorer adhesive qualities and higher brittleness of polyester that
there was a risk of it cracking.

Andrew Butchart

On 25 Jul 2006 06:54:42 -0700, wrote:

Thank you everyone for your input. I will probably ignore the advise
to throw away my remaining resin and spend 3 times as much for epoxy
and run the chances of developing an alergic reaction. PLEASE - the
whole polyester vs epoxy controversy has been done to death. I know -
I've been part of it on this forum for years. I had hoped that this
thread wouldn't re-ignite it but it seems that it has. I went into the
project fully aware of the impact of my materials choices.

I will however plan on putting the panels in place before coating them
- reducing the chances of resin failure.

Hi,

You could use a bonding agent to go between the resin and wood to
improve the bond.

Someone here in the UK recommended Bondaglass G4 which is a moisture
curing polyurethane pond sealer. I'd have thought the nearest thing in
the US is POR-15, another moisture curing polyurethane coating.

It would be worth trying a few samples with a small amount of POR and
seeing how much better it is than without.

If you need a lot of it, an industrial coatings supplier might be able
to find something similar at a reasonable price.

cheers,
Pete.

wrote in message
ps.com...
Thank you everyone for your input. I will probably ignore the advise
to throw away my remaining resin and spend 3 times as much for epoxy

And what percentage is that compared to the entire boat?

and run the chances of developing an alergic reaction.

Mmm.... allergic vs whatever you get from inhaling styrene (carcinogenic)
fumes.....

PLEASE - the
whole polyester vs epoxy controversy has been done to death. I know -

It is then all the more surprising to see you went for poly..... :-)

Meindert

May I call to your attention an earlier post, from the original poster?




I had hoped that this
thread wouldn't re-ignite it but it seems that it has. I went into the
project fully aware of the impact of my materials choices.



Those of us who choose to build with poly do so knowing full well the
potential consequences of our actions. We have heard the arguments,
perhaps more of them than we care to hear, and will proceed on our
decided course, regardless. You are welcome to sit back and smugly
think, "Those a$$(#*$* are going to get themselves killed, and I'll be
right there to say I told you so", but quit trying to convince us otherwise.

FWIW, I use epoxy and poly both, depending on what I'm building.

Chuck