From my experience of building and repairing polyester/fibreglass canoes
damaged during rock-bashing/ white-water canoeing - polyester patches were
not durable and could be ripped off the damaged canoe, with very little
effort - where as epoxy patches showed much superior adhesion.
Applying polyester over epoxy would result in a useless bond - suggest you
test your proposed method with a small piece of fibreglass/polyester applied
to the stich and glue surface and try removing it after about one week.
I would use epoxy - apart from its superior adhesion and water resistance,
it is not as toxic as polyester - that sweet smell of polyester is cancer
producer whereas the nasty chemical in epoxy is not sufficiently volatile to
be a problem - just prevent skin contact with epoxy.
Where did I acquire this wisdom - building small multihulls using epoxy,
during the previous 17 years - see the Yacht Research Homepage under Project
Windrigger.
Ian Smith


"My news" wrote in message
...
Any advise or comment if I will use polyester and fiber glass on top of
cured and sanded epoxy on stich and glue? My plan is to prime the entire
hull with epoxy for a good bind before the application of
fiberglass/polyester skin.

I want to introduce this idea to the poor fishermen in the Philippines for
economic reason.

Ineke and Ian wrote:
From my experience of building and repairing polyester/fibreglass canoes
damaged during rock-bashing/ white-water canoeing - polyester patches were
not durable and could be ripped off the damaged canoe, with very little
effort - where as epoxy patches showed much superior adhesion.
Applying polyester over epoxy would result in a useless bond - suggest you
test your proposed method with a small piece of fibreglass/polyester applied
to the stich and glue surface and try removing it after about one week.
I would use epoxy - apart from its superior adhesion and water resistance,
it is not as toxic as polyester - that sweet smell of polyester is cancer
producer whereas the nasty chemical in epoxy is not sufficiently volatile to
be a problem - just prevent skin contact with epoxy.
Where did I acquire this wisdom - building small multihulls using epoxy,
during the previous 17 years - see the Yacht Research Homepage under Project
Windrigger.
Ian Smith


"My news" wrote in message
...
Any advise or comment if I will use polyester and fiber glass on top of
cured and sanded epoxy on stich and glue? My plan is to prime the entire
hull with epoxy for a good bind before the application of
fiberglass/polyester skin.

I want to introduce this idea to the poor fishermen in the Philippines for
economic reason.






Hi Ian,

Looking over your work reminded me of a project I wanted to try some time back.
I thought it might be interesting to build a "strip planked" hull using strips
of blue construction foam and toothpicks. then glass inside and out - with
epoxy, of course...

Thanks for sharing.

Richard

cavelamb wrote:

I thought it might be interesting to build a "strip planked" hull using
strips
of blue construction foam and toothpicks. then glass inside and out - with
epoxy, of course...


Richard,

Back in the 60's Popular Mechanics / Science and Mechanics / Mechanics
Illustrated had a building article:

"Foamy, the boat you build with a razor blade"

I haven't been able to find it online.

Kevin Gallimore

axolotl wrote:
cavelamb wrote:

I thought it might be interesting to build a "strip planked" hull
using strips
of blue construction foam and toothpicks. then glass inside and out -
with
epoxy, of course...


Richard,

Back in the 60's Popular Mechanics / Science and Mechanics / Mechanics
Illustrated had a building article:

"Foamy, the boat you build with a razor blade"

I haven't been able to find it online.

Kevin Gallimore

Cool.

Did you try the PM archives?

Richard

cavelamb wrote:


Did you try the PM archives?


Didn't see it. My unreliable 40 year old recollection is that it was in
Science and Mechanics.

Kevin Gallimore