Thin Epoxy

[gordon stelter]

Yes.
    Thump

--- Kerry Cooper <brispiano@optushome.com.au> wrote:
> Del,
> 
> If this CPEST is flexible, wouldn't that detract
> from the vibration
> transmitting characteristic required to produce a
> good clear sound?
> 
> Kerry Cooper
> Australia
> ----- Original Message -----
> From: "Delwin D Fandrich" <pianobuilders@olynet.com>
> To: "Pianotech" <pianotech@ptg.org>
> Sent: Thursday, February 27, 2003 4:49 PM
> Subject: Re: Thin Epoxy
> 
> 
> >
> > ----- Original Message -----
> > From: "Farrell" <mfarrel2@tampabay.rr.com>
> > To: <pianotech@ptg.org>
> > Sent: February 26, 2003 7:54 PM
> > Subject: Thin Epoxy
> >
> >
> > > I ran across this site and thought of Del and
> Ron N. and Ron O. They are
> > out by Del. The topic of low viscosity epoxies has
> come up on the list
> > often.
> > >
> > >   http://www.rotdoctor.com/products/product.html
> > >
> > > A couple very interesting products:
> > >
> > > -    CPEST (Clear Penetrating Epoxy Sealer)
> > > -    Tropical Hardwood Epoxy AdhesiveT
> > >
> > > The sealer is said to be of diesel fuel
> viscosity and penetrates into
> wood
> > way more than other epoxies (laminating bridge
> caps - your soundboard
> > coating thing). They also claim that WestSystem is
> petroleum based and
> cures
> > brittle (I certainly agree that it is
> brittle).They say their epoxy is
> wood
> > based and cures flexible. I'm not sure exactly how
> that might
> benefit/effect
> > our work on pianos, but there it is (in a bridge
> cap, I don't see where it
> > would make much difference - brittle or flexible).
> The penetrating sealer
> > really gets my interest. Hmmm. Maybe we can
> laminate a thin strip of
> Kevlar
> > into those bridge caps and use this penetrating
> sealer for the ultimate
> > bridge cap - 'course it might be a bit of work to
> get a pin in it and to
> > notch it.
> >
>
------------------------------------------------------
> >
> >
> > I am aware of this product, but have not used it.
> I've been just a bit
> > apprehensive, mostly because I consider the
> advertising and promotion,
> along
> > with the so-called comparison tests, to be just a
> little bit misleading.
> > Basically, CPEST is a solvent-thinned epoxy resin.
> The major difference
> > between this and other standard structural epoxies
> is that CPEST is
> supplied
> > pre-thinned. In these 'tests' only its penetrating
> capability, not its
> > structural strength, is being compared, yet the
> other standard,
> > multi-purpose coating and penetrating epoxies have
> not been thinned to
> > anywhere close to the viscosity of CPEST. I
> suspect that if the other
> > epoxies had been thinned out with their
> appropriate solvents to the same
> > viscosity as CPEST they would have penetrated much
> better than is
> indicated
> > in this test. They would also loose some of their
> structural strength, as
> > does, I suspect, Dr Rot. But this characteristic
> is not tested. You may
> > notice that CPEST is not really being marketed as
> a structural epoxy while
> > the others are. In terms of flexibility, if
> structural epoxies such as
> WEST
> > System or System Three structural epoxies
> significantly they cure to a
> > somewhat more flexible state as well.
> >
> > So, what have we? I suspect that CPEST is a basic
> structural epoxy thinned
> > with whatever thinners are appropriate for the
> resin/hardener system and
> > sold as a thin, penetrating epoxy sealer that is
> "strong." Before becoming
> a
> > believer I would like to read an independent
> analysis of the material.
> >
> > Besides, in the soundboard work I've been doing I
> don't want the kind of
> > penetration being described by Dr Rot. These
> boards are not rotten, they
> are
> > structurally and stiffness impaired. I want all of
> the structural strength
> > and stiffness I can get. O.K., within reason.
> >
> > Del
> >
> >
> 
> _______________________________________________
> pianotech list info:
https://www.moypiano.com/resources/#archives


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