Fibreglass mix

PostPost by: "Richard Hinds" » Wed Jul 28, 1999 8:47 pm

Hi there,
I'm having a little difficulty with some resion I purchased.
It was a "bulk buy", about 3 litres of resin, which has a slight "bluey"
tinge, plus normal liquid catylist (MEK).
Does anyone have a good "ready reckoner" to calculate the correct amount of
catylist to add to the resin?
I was originally told about 3% (presumably by volume), but visually that
looks to be too much (30cc of catylist per 1000cc of resin).
I'm just doing ordinary "laying up", i.e. fibreglass repairs to the body of
my battered +2S.
Any advice gratefully received.






"Richard Hinds"
 

PostPost by: types26/36 » Thu Jul 29, 1999 1:40 am

About 7-8 drops of catalyst per ounce of resin depending on ambient temp.
Use an eyedropper for the catalyst if the dispenser doesn't have a
drop-top. I like the disposable graduated cups for mixing.

I have used resin with a blue dye that turns clear as soon as the catalyst
kicks in.

If you still have troubles, it may be that the resin is too old. Depending
on storage temperature, it is only good for about a year before it becomes
reluctant to catalyze. I do a lot of fiberglass repairs but I buy it in
quarts so it is always fresh.

Randall
Seattle






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PostPost by: Richy-dick » Thu Jul 29, 1999 3:33 am

Richard

2% catalyst under normal temperature conditions, adjusted either way if very
cold or very warm ambient temp.
Strand Glassfibre or Scott Bader in the UK are very helpful.

Richard A Clifton
Wakefield

----- Original Message -----
From: Richard Hinds <[email protected]>








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PostPost by: paul_adamson » Thu Jul 29, 1999 8:02 am

3% sounds in the right region.

I would suggest you mix up a small batch-- say 20ml - - take some glass, lay an old polythene bag on a flat board.
Paint some resin on it and then lay up a test piece of GRP.

You sould get a about an hour working time at 20 deg C. 45min at about 30. Hte materiarial shoul be set hard next day.

You can then judge wheteher you need more or less catalyst.


In boat building and repair this is considerede good practise when a new batch of resin and catalyst or glass is obtaines.

Brian

---------------------o0o------------------
Brian Scally - Philips Semiconductors Systems Lab. Southampton UK
tel : +44 2380 312654 fax : +44 2380 316303
mailto:[email protected] seri : bscally@ukpsshp1





Richard Hinds <[email protected]> on 28/07/99 22:20:29
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From: "Richard Hinds" <[email protected]>

Hi there,
I'm having a little difficulty with some resion I purchased.
It was a "bulk buy", about 3 litres of resin, which has a slight "bluey"
tinge, plus normal liquid catylist (MEK).
Does anyone have a good "ready reckoner" to calculate the correct amount of
catylist to add to the resin?
I was originally told about 3% (presumably by volume), but visually that
looks to be too much (30cc of catylist per 1000cc of resin).
I'm just doing ordinary "laying up", i.e. fibreglass repairs to the body of
my battered +2S.
Any advice gratefully received.




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PostPost by: Brian Walton » Thu Jul 29, 1999 5:54 pm

try 1/1.5% by volume depending on the surrounding temperature.
Warmer temperatures..1%, colder temperatures about 2%.

It's -5 at the moment down here in the Southern Alps....so I'm
keeping off any fibreglass work.

Hope this helps

Brian Walton





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