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Old Oct 07, 2007, 03:01 PM
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Joined Oct 2007
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mixing epoxy resins

I'm building a part using a Styrofoam core and I plan to wrap it in fiberglass to strengthen it for compression before I wrap it with carbon fiber. The kit i bought for the fiber glass uses a polyester resin. Is there any issue with this bonding to the epoxy (MGS) or the metal parts attached to it?
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Old Oct 07, 2007, 04:23 PM
Come out swinging
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San Diego
Joined Mar 2005
2,685 Posts
I'd stay away from the polyester. If you plan on using epoxy, why not use epoxy for the entire layup?

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Old Oct 07, 2007, 04:53 PM
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Joined Jun 2007
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That, and the polyester is going to eat the EPS. (UP is thinned with styrene monomer.)

And why glass first and not CF directly? The styrofoam will be as delicate when you glass it as when you CF it.
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Old Oct 07, 2007, 05:09 PM
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Melbourne Australia
Joined Jul 2005
8,362 Posts
...also epoxy and polyester won't stick together well + carbon won't bond with polyester.

Remember, the glass won't take any load until the carbon breaks... It's is just a "passenger" along for the ride.
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