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zailor View Drop Down
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    Posted: 18 May 10 at 5:28pm

Hi

I have some of those powders you put into epoxy to make it so more magical things!

I have collodical sillica
Microballoons (sound like something the smurfs have on a birthday party!)
And Mirofibres.

I've used the sillica to make the epoxy more, thick and thats what I used to fix the "shark bite" in my dagger board my moulding it into a blob and sanding down.

Anyway, what do there magic powders do to epoxy and what are their uses?

Thanks

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JimC View Drop Down
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Post Options Post Options   Quote JimC Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 10 at 5:49pm
Silica - thicker/thixotropic, brittle
Microfibres - stronger, flexible
microballoons and similar - lighter and, since you use less epoxy, probably cheaper
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zailor View Drop Down
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Post Options Post Options   Quote zailor Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 10 at 5:57pm

so Im guessing I was right using silica for the dager board so its strong but brittle but I wont want flex

But the microfibers will be good for fixing my europe deck as in its old age its bound to flex!

And microballons, filling holes?
By lighter do you mean in weight or something else, forgive my dumbness

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alstorer View Drop Down
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Post Options Post Options   Quote alstorer Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 10 at 7:15pm
by lighter he means less dense, yes- microballoons are hollow glass spheres.
silica does help make the finished resin harder, but in formulation tends to come into it's own in viscosity control- important more for un-cured properties, such as the ability to mix properly when pumped through a "static" mixer.
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Rupert View Drop Down
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Post Options Post Options   Quote Rupert Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 10 at 8:20pm
The silica is the most difficult to sand back after, too, which may affect where you use it.
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zailor View Drop Down
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Post Options Post Options   Quote zailor Quote  Post ReplyReply Direct Link To This Post Posted: 18 May 10 at 8:37pm

yes I found that out when I used it on my dagger board, I used the massive blob then sand down technique.

Thank god for power tools

 

So last question, would I use the micro fibres/ballons to get the right viscosity or add sillica to the epoxy/balloon/fibres mix?

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