Can fiberglass resin go bad? - Fiberglass RV


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Old 03-07-2016, 07:34 PM   #1
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Can fiberglass resin go bad?

This afternoon, in a warm garage, I mixed some fiberglass resin and some hardener together. It seems like I had the right proportions... I did my job, left and came back three hours later to find everything as liquidy as when I left. The resin was purchased a couple years ago. I didn't think it could go bad...can it? The tint was greenish instead of the regular caramel color.

I washed everything and started over with new resin. All seems normal this time.
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Old 03-07-2016, 10:16 PM   #2
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Can fiberglass resin go bad?

I have used West epoxy that was a few years old without problems. The time I did have problems was when I was using the pre measured pumps that would pump out the Resin and Hardener at the correct proportion. I did not realize, but I was getting less hardener than the proper amount. (It seemed to be the right proportion). The epoxy never really cured, though it seemed to. Paint would not stick and I eventually had to torch it off the boat I was building.


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Old 03-08-2016, 12:01 AM   #3
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...epoxy resin has an almost indefinite shelf life...fiberglass(polyester) resin has a definite shelf life...MEK can help it last longer...look on fiberglass boat forums for more info on this.....
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Old 03-08-2016, 09:13 AM   #4
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I agree about the pumps, they can clog and not give out equal portions so the mix would be off and not set right. I have used 10 year old resin and the only difference was it darkened a little more amber coloured as it aged. But worked fine.
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Old 03-08-2016, 07:08 PM   #5
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Sometimes the hardening process needs to be triggered if the ambient temperature is not warm enough. You can do this with a heat lamp or heat gun. Even a blow dryer for hair can do this.
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Old 03-08-2016, 07:19 PM   #6
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The catalyst is definitely bad and probably the resin is bad also...sorry, but I would buy fresh...Fiberglass Dave
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Old 03-08-2016, 08:29 PM   #7
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Quote:
Originally Posted by Uncle Cereal View Post
This afternoon, in a warm garage, I mixed some fiberglass resin and some hardener together. It seems like I had the right proportions... I did my job, left and came back three hours later to find everything as liquidy as when I left. The resin was purchased a couple years ago. I didn't think it could go bad...can it? The tint was greenish instead of the regular caramel color.

I washed everything and started over with new resin. All seems normal this time.
Were I work we make composite resins ( fiberglass ) is just one name.
As it gets old it will gell up , you can still use two year old resin but it may take longer to harden up. You should mix it 100 to 1 resin to hardener.

Last summer I was doing some fiberglassing and did not use enough hardener and it took over night to dry.

Hope this helps.
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