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 Post subject: fiberglass resin
PostPosted: May 18th, 2009, 10:38 am 
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Joined: July 5th, 2007, 6:20 pm
Posts: 15
Hi. This might be a stupid question but does anyone know if you don't add hardener to fiberglass resin,does it eventually harden anyways? Thanks


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 Post subject: Re: fiberglass resin
PostPosted: May 18th, 2009, 11:18 am 
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Joined: May 7th, 2006, 12:18 pm
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Location: StPaul MN
Sorry it will not harden.
CB


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 Post subject: Re: fiberglass resin
PostPosted: May 18th, 2009, 2:41 pm 
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:o

Here's hoping you aren't asking that question after the fact. :doh:

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 Post subject: Re: fiberglass resin
PostPosted: May 18th, 2009, 2:59 pm 
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Polyester and vinylester resins WILL harden eventually. They are obtained from suppliers with a promoter already mixed in. If the catalyst is added, they harden faster, but if just left in the (preferably clean glass) container, they will harden in a few months anyway. This was my experience with vinylester resin.

All repair work is best done with epoxy resin. It does not harden unless mixed with the hardener. It will stay usable for a few years. Epoxy sticks well to boats made with polyester and vinylester. It is greatly superior to polyester, and somewhat superior to vinylester, in strength, flexibility, and bonding to other materials. But many fine boats are made with vinylester. I have both epoxy and vinylester boats, and I find no difference in them in use or abuse.


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 Post subject: Re: fiberglass resin
PostPosted: May 18th, 2009, 3:27 pm 
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Yes, it will. Heat gun.

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 Post subject: Re: fiberglass resin
PostPosted: July 10th, 2009, 11:59 pm 
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You can also put a hot mix on top to speed the resin that's without catalyst.

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 Post subject: Re: fiberglass resin
PostPosted: July 11th, 2009, 9:10 am 
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When the original poster said "hardener," I assumed he meant epoxy. Others think he meant polyester or vinylester resin.

The MEKP catalyst used to cause polyester or epoxy resin to harden is not a "hardener." Ester resins will harden eventually without catalyst, if a "promoter" has been added by the supplier.

Epoxy resin will never harden unless the matched hardener component is mixed in, in an appropriate ratio. Heating without the hardener will not harden it, and no "catalyst" will harden it. I have cans of West resin sitting around for several years that only show a slight increase in viscosity. The West 205 hardener will darken and thicken, but remains usable.


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