micro-balloons etc

[Verne Koester]

Tom,
Sounds like cabosil. If you touch it dry, it'll have a very weird feeling to
it. Can't describe it but it'll be kind of a dry feeling you've never felt
before. As far as mixing it, thin finishing resin works much better than the
thicker construction stuff. Cabosil and finishing resin is the industry
standard for putting fillets in the corners of a layup so the cloth will
handle the radius. The common term for a mixture of resin and cabosil is
paste. When mixing it, test it by scooping up a glob of the stuff on a
popsicle stick. If it doesn't flow with gravity, you're just about right.
Fillets made with paste that's too thick almost always have air trapped
underneath that will be a crater to fill in the finished product. Hope this
helps. BTW, cabosil is GREAT stuff. I haven't bothered with microballoons
since I found out about it. It IS a monster to sand, though.

Verne


----- Original Message -----
From: "Koenig, Tom" <Tom.Koenig at actewagl.com.au>
To: "'Discussion'" <discussion at nsrca.org>
Sent: Sunday, May 18, 2003 8:40 PM
Subject: micro-balloons etc


>
> Help.....please
>
> Gray, Matt, Lance.... anyone.
>
> I have a huge tub at home that is a white fluffy powder, which weighs
> nothing...( Nooooo....not that sort of powder<VBG>) I dont know wether it
is
> micro balloons or cabosil, or whatever.
> When I mix it with epoxy it sort of forms the white stuff which you
commonly
> see in the corners of layups ( to help lay the glass), but it isnt quite
the
> same, it seems to be more translucent.
> Am I not mixing properly? It seems that when I keep adding more powder it
> becomes too dry and unworkable. It also doesn't seem that light which
makes
> me think it isnt micro balloons. Is it the resin I'm using ( LC 3600)?
>
> Sorry for the moronic question...but how can I tell what I've got? Also
what
> exactly is used as the fillers in the ZN kits, Bollys etc ? Do they use a
> thixotropic additive in the resin when they form the fillets etc.
>
> Thanks guys
>
> Tom
>
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