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Boat Forum / Building / September 2006



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Storing Resin

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Andrew Butchart - 26 Sep 2006 19:42 GMT
Autumn has definately arrived here along with colder temperatures.  I
have a couple of gallons of polyester resin that I'd rather not move
into the house.  It's in a plastic pail right now and the "scent" tends
to spread.  I've tried putting the pail into a garbage bag but can
still smell it.

Would it be harmed if I just left it in the shed and the temperature
falls well below freezing?  I'm hoping for enough nice days to finish
my hull but can't count on it.

Andrew B
RW Salnick - 26 Sep 2006 20:05 GMT
Andrew Butchart inscribed in red ink for all to know:
> Autumn has definately arrived here along with colder temperatures.  I
> have a couple of gallons of polyester resin that I'd rather not move
[quoted text clipped - 7 lines]
>
> Andrew B

Actually, storing it in a cool or cold place is one of the best things
you can do to preserve it.  Styrene freezes at -31 C, so you will likely
be well above its freezing point.  But even if it did freeze, it does
not swell when freezing, so there is no risk of bursting the container.

bob
RW Salnick - 26 Sep 2006 20:29 GMT
RW Salnick inscribed in red ink for all to know:
> Andrew Butchart inscribed in red ink for all to know:
>
[quoted text clipped - 16 lines]
>
> bob

<answering my own reply - geez>

OK, styrene is only one of the components of polyester resin.  It is
still true that cool/cold is good, and that it will not swell if it
should actually get below the freezing point.

bob
marierdj@nb.sympatico.ca - 27 Sep 2006 02:43 GMT
I did not have any luck with storing polyester resin.  I soon learned that
the resin has a shelf life.
When I purchased the 1 gallon I now have I did not know how long it stood on
the shelf before.
The first year I used about 1/4 of the gallon and stored the rest for the
following year at room temperature.
Then the following spring I used some of the resin and quickly found out
that it did not cured at all after several days.
I bought new resin and it did cured well.  Now I have to dispose 1/2 gallon
of resin.  Legally I cannot closed the gallon and put it in the garbage.  I
was told that the resin has to solidified before it can be disposed.  The
question is how am I going to solidify the un - curable resin already in the
gallon can??  Conversely I do not have problem with epoxy resin.

> RW Salnick inscribed in red ink for all to know:
>> Andrew Butchart inscribed in red ink for all to know:
[quoted text clipped - 25 lines]
>
> bob
Meindert Sprang - 27 Sep 2006 11:56 GMT
> Then the following spring I used some of the resin and quickly found out
> that it did not cured at all after several days.

Have you tried to put some extra catalyst ("hardener") in the resin?
> I bought new resin and it did cured well.  Now I have to dispose 1/2 gallon
> of resin.  Legally I cannot closed the gallon and put it in the garbage.  I
> was told that the resin has to solidified before it can be disposed.  The
> question is how am I going to solidify the un - curable resin already in the
> gallon can??  Conversely I do not have problem with epoxy resin.

Which is logical. Polyester resin only needs a catalyst ("hardener") to
start to cure while with epoxy, the hardener is part of the chemical
reaction to form resin. So without the hardener, there will be no resin.

Meindert
MMC - 27 Sep 2006 15:34 GMT
We have sheduled days that we can drop hazardous materials at the county
landfill. Maybe give them a call?
MMC
>I did not have any luck with storing polyester resin.  I soon learned that
>the resin has a shelf life.
[quoted text clipped - 40 lines]
>>
>> bob
RW Salnick - 27 Sep 2006 21:55 GMT
marierdj@nb.sympatico.ca inscribed in red ink for all to know:
> I did not have any luck with storing polyester resin.  I soon learned that
> the resin has a shelf life.
[quoted text clipped - 40 lines]
>>
>>bob

Perhaps it is the hardener which has gone bad?  This is a very active
chemical (an organic peroxide).  But I've never had that happen to me,
even with 5 year old hardener...

bob
Brian Nystrom - 28 Sep 2006 21:05 GMT
> marierdj@nb.sympatico.ca inscribed in red ink for all to know:
>> I did not have any luck with storing polyester resin.  I soon learned
[quoted text clipped - 48 lines]
> chemical (an organic peroxide).  But I've never had that happen to me,
> even with 5 year old hardener...

I've had some that seemed to have lost its potency. It's easy to find;
even Home Depot and Lowes have it.
Andrew Butchart - 27 Sep 2006 15:32 GMT
> RW Salnick inscribed in red ink for all to know:
> > Andrew Butchart inscribed in red ink for all to know:

<snip>

> OK, styrene is only one of the components of polyester resin.  It is
> still true that cool/cold is good, and that it will not swell if it
> should actually get below the freezing point.
>
> bob

Dandy - that will make my wife happy.  She never liked having the stuff
in the house.  I'm just hoping for enough warm weather to get done with
the hull this season.

Andrew B.
Glenn Ashmore - 27 Sep 2006 17:21 GMT
I haven't had much luck storing polyester more than 6 or 8 months.  The
stuff I have had will start to polymerize on its own after that.

Signature

Glenn Ashmore

I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at:  http://www.rutuonline.com
Shameless Commercial Division: http://www.spade-anchor-us.com

> Autumn has definately arrived here along with colder temperatures.  I
> have a couple of gallons of polyester resin that I'd rather not move
[quoted text clipped - 7 lines]
>
> Andrew B
Wm Watt - 27 Sep 2006 18:08 GMT
> Autumn has definately arrived here along with colder temperatures.  I
> have a couple of gallons of polyester resin that I'd rather not move
[quoted text clipped - 7 lines]
>
> Andrew B

I've actually had a can of Canaidan Tire polyester resin sit in the
back of my fridge for 20+ years and then used it all up before buying
another can. I'd keep the resin aritight and cool. Wrap a wire tie
around the plastic bag and maby suck the air out of it for good
measure. I've heard that if it crystalizes it can be heated and used.
Brian Nystrom - 27 Sep 2006 20:43 GMT
>> Autumn has definately arrived here along with colder temperatures.  I
>> have a couple of gallons of polyester resin that I'd rather not move
[quoted text clipped - 13 lines]
> around the plastic bag and maby suck the air out of it for good
> measure. I've heard that if it crystalizes it can be heated and used.

I've had good luck with refrigerating gelcoat, which is also a polyester
resin product, though it's been more like two years than twenty.
 
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