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Old 23 April 2009, 13:38   #1
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Country: UK - Channel Islands
Town: A large rock
Boat name: La Frette
Make: Osprey Vipermax
Length: 6m +
Engine: 200 Suzzy
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Glass cloth for polyester and epoxy resin?

I'm in the process of repairing my parent's motor boat and need to glass over an old intake hole in the hull. I've been using the West System epoxy resin recently on other repairs, but I can't get any woven cloth locally that says it is suitable for epoxy resin. The only cloth I can buy is made by Bonda and states it is for Polyester resin. Is this just an advertising trick to make sure you buy their polyester resin, or is it more fundamental than that and not compatible with epoxy resins?

I remember reading once that the binders in csm are specific to the resin as to how they dissolve to ensure good wetting out, but I can't imagine there's a need for binders in woven cloth.

Any thoughts?

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Old 23 April 2009, 13:40   #2
Country: UK - England
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Can't help with advice but give a call and they will. They are very helpful.

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Old 23 April 2009, 16:59   #3
Country: UK - Wales
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You are right - woven is fine = it's the CSM you have to worry about.
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Old 24 April 2009, 03:40   #4
Country: UK - England
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Make: me
Length: 7m +
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Originally Posted by codprawn View Post
You are right - woven is fine = it's the CSM you have to worry about.
Not always true, some woven contain binders. Cloth is normaly clean.
If in doubt test a sample and if the resin soaks into the mat easily leaving no white dry areas and cures correctly it should be fine.
But I may be talking Rubbish.
Expurt is a drip under pressure, and the difference between an Amateur and a proffesional is getting paid.
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