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Dan Spector
Joined:
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02-Jan-2008
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Started On : 15-Aug-2009 at 09:17:29 AM, #Views : 6118
Topic Subject : Re: PVA glue and Hydrostone |
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Hi Olivier
I used to add pva glue to plaster, thinking I would increase my
properties, but I realized if i mixed my plain plaster correctly, and
used fiberglass, i got excellent strength. You are adding it to
HydroStone which is already the hardest plaster. You are happy to
overcome the way H'stone stays liquid and flows downhill. Maybe the
glue is fighting the formation of the water trails that annoy us.
Adding Hydrocal to Hydrostone will also stop it from "snap setting"
and give you the ability to slushcast. I assure you, your plaster is
not waterproof. Make up a wastepiece and place it where rain runs off
your roof. In fact, that would be a great experiment: make 3 tiles
of Forton, PVA and plain Hydrostone. See how they fare over a season
or two outside.
We are told that by mixing HydroStone extremely thoroughly, the water
trails won't happen. Here again, it's worth some experimentation.
The Forton and Matrix people say that concrete made with their mixes
come out absolutely perfect, so using it seems to prevent surface
blemishes of all kinds.
Dan Spector
901 323 8717
www.lifecast-art.com
dan@archicast.com
On Aug 15, 2009, at 1:17 AM, aliforum@lifecasting.org wrote:
>
> Hello Dan Spector
>
> Post Date : Saturday 15th 2009f August 2009 02:11:07 AM
> Posted by : "Olivier Duhamel" olivier@duhamel.bz
>
> PVA glue and Hydrostone:--
> Hi everyone
>
> Has any of you ever tried mixing PVA glue in Hydrostone? I have
> started doing this over the last few months as a cheap alternative
> to Forton... I now swear by it... Not as strong as Forton but can
> be fiberglass reinforced like Forton. It is very easy to apply in
> silicon or alginate molds, does not run off vertical walls... sets
> quickly...my resulting castings are of a consistent high quality
> with no air bubbles pin holes, no "runneth" no cracks in the first
> layer...
> I make it almost twice as thick as I would a Forton cast but it is
> still much much cheaper... It aslo seems to survive nicely outdoor
> (but I have not been using it long enough to be sure.)
>
> There must be a catch...? has anyone tried this and found any major
> drawback or inconvenience that escaped me?
>
> Olivier
>
> www.bodyscape.net.nz
>
>
>
>
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