Secondary bond?

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Rob Hart - 30 Dec 2004 18:38 GMT

Have a glass fibre moulding, which needs to have another glass part bonded
to it, after the first part has fully cured.

Would I be right in thinking that an epoxy resin system, with proper filler
added so it aheres to vertical surfaces, would be the best way of going
about this?

TIA
Rob

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Evan Gatehouse - 31 Dec 2004 22:54 GMT

> Have a glass fibre moulding, which needs to have another glass part bonded
> to it, after the first part has fully cured.
>
> Would I be right in thinking that an epoxy resin system, with proper filler
> added so it aheres to vertical surfaces, would be the best way of going
> about this?

Yes, but for best strength you need to rough up the cured part with 80 grit
sandpaper to also provide a mechanical bond.

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Evan Gatehouse

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Twilk - 02 Jan 2005 00:29 GMT

I like to grind down until I see the threads of the cloth almost showing or
just starting to break through. Less resin better bond is a primary rule of
glasswork. It also fairs better.
I also like to thicken with milled glass fiber rather than the usual bulkers
and cabo.
It's the best way to strengthen the weakest part, "the resin".

----- Original Message -----
From: "Evan Gatehouse" <NONE@sasaf.bobo>
Newsgroups: rec.boats.building
Sent: Friday, December 31, 2004 5:54 PM
Subject: Re: Secondary bond?

> > Have a glass fibre moulding, which needs to have another glass part bonded
> > to it, after the first part has fully cured.
[quoted text clipped - 3 lines]
> > added so it aheres to vertical surfaces, would be the best way of going
> > about this?

> > Have a glass fibre moulding, which needs to have another glass part bonded
> > to it, after the first part has fully cured.
[quoted text clipped - 6 lines]
> Yes, but for best strength you need to rough up the cured part with 80 grit
> sandpaper to also provide a mechanical bond.

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Boat Forum / Building / January 2005

Secondary bond?