Thin Epoxy

[gordon stelter]

But this thinned epoxy might make a dandy coating for
the inner chambers of pneumatiuc player systems!
     Thump

--- Delwin D Fandrich <pianobuilders@olynet.com>
wrote:
> 
> ----- 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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