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Don't forget vinylester resin




First off, epoxy is the cure-all for hull and deck
repairs; don't even waste your time trying to find
polyester resin. More often than not an epoxy repair
done right is stronger and more durable than its
polyester predecessor.

There's a lot of history behind this. In the 70s and
early 80s many boatbuilders thought polyester resin
gelcoat to be the most fullproof material for
fiberglass boats. Many years and thousands of osmotic
blisters later they discovered that polyester resin
was neither fullproof nor, more importantly
waterproof. For the trailerable sailboats it worked
fine and is still used in many of the smaller boats
today, but for boats mostly slipped in the water
polyester resin just wasn't the answer. Sometime in
the early to mid-80s many larger boat builders began
shifting to vinylester resin. Ever wonder why people
apply a barrier coat and an anti-fouling bottom coat
to a boat below the waterline? ANSWER: Polyester
resin. The barrier coat repels moisture away from the
polyester; vinylester boats don't need the barrier
coat.


--- "Gary A. Rogers" <rogersg@panola.cc.tx.us> wrote:
> Does anyone know what resin was used to laminate the
> hull and deck of
> the San Juan 23?  Was it polyester resin or epoxy
> resin?  Don Casey, in
> his book "This Old Boat" writes, "Unless you know
> otherwise, it is safe
> to assume that your boat was laminated with
> polyester resin since not
> one boat in a thousand is epoxy laminated."  If it
> is polyester resin
> that the hull and deck were laminated with, can you
> use epoxy for
> repairs, or does it need to be repaired with
> polyester resin?  Are there
> adhesion problem? .
> 

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