Aromatic solvents are "hot" solvents such as acetone,
toluene, etc.. Very strong, very volatile, melt
plastics, etc.. They are used in lacquers.
Aliphatics are mineral spirits, turpentine,
kerosene.........used in paints and varnishes, not as
strong or volatile.
Hot solvents can be added to cold solvent finishes to
aid drying, but if aliphatic solvents are put in
lacquer they will settle out. Not compatible.
Thump
--- Farrell <mfarrel2@tampabay.rr.com> wrote:
> I've never had an adhesion problem with topcoats on
> epoxy, but I know sometimes cured epoxy develops a
> waxy type coat on it. But, cured epoxy needs to be
> sanded, and good spar varnishes will have some type
> of solvent they recommend for cleaning the surface
> during prep. I have made the mistake before - "I
> always use brand X turpentine and have had good
> results" then when you use brand Y topcoat you get
> some kind of incompatibility thing going on. I have
> found that if the topcoat (paint or varnish) says to
> use Interlux #333 solvent cleaner, then by golly
> gosh, I'm going to use Interlux #333 solvent
> cleaner, and I will experience no problems.
>
> So, my recommendation is to clean with recommended
> solvent, sand to appropriate grit, and then clean
> again with recommended solvent. You should have no
> compatibility problems. I would also make sure that
> the epoxy was properly mixed and has cured for a
> week or so at appropriate temperatures.
>
> Terry Farrell
>
> ----- Original Message -----
> From: "Delwin D Fandrich" <pianobuilders@olynet.com>
> To: <davidlovepianos@earthlink.net>; "Pianotech"
> <pianotech@ptg.org>
> Sent: Saturday, March 01, 2003 11:32 AM
> Subject: Re: System Three Varnish
>
>
> >
> > ----- Original Message -----
> > From: "David Love" <davidlovepianos@earthlink.net>
> > To: "Pianotech" <pianotech@ptg.org>
> > Sent: February 28, 2003 5:50 PM
> > Subject: Re: System Three Varnish
> >
> >
> > >
> > > I'm not sure why the flexibility of the varnish
> would matter. Either the
> > > board is stiff or it isn't. In the case of an
> epoxied board, the epoxy
> > > provides the stiffness and the varnish topcoat
> is not required to
> > > contribute additional stiffness. Nor would it
> make the epoxy any less
> > > stiff by virtue of its flexibility, if it is, in
> fact, flexible. I have
> > > used varnishes for years on soundboards, usually
> over a shellac undercoat
> > > without detriment. In this case, since I am
> stiffening the board with
> > > epoxy and System Three makes a varnish that
> supposedly does not have any
> > > compatibility with their epoxy. I was more
> wondering about the cosmetic
> > > quality.
> >
> >
> > David,
> >
> > As I said earlier, I've not used System Three
> varnish. But the compatibility
> > issue may be a valid one. I've had one combination
> of epoxy/varnish give me
> > problems. The varnish never did thoroughly dry and
> had to be stripped off
> > and replaced. It also softened the surface of the
> epoxy. It had to be
> > scraped down to hard, clean epoxy. I took it back
> to just the surface of the
> > wood. All in all a real mess. I then recoated and
> went on. This was some
> > years back and the epoxy was an off-brand
> purchased from a (then) local
> > marine supply store. The varnish was purchased at
> a (then) local paint
> > store. I don't remember the brand but it was not
> one of the major marine
> > varnishes. I've subsequently been told that these
> problems are rare but they
> > still can occur. I don't know why they occur or
> what there is in either
> > product that might create the potential problem.
> The chemists out there are
> > welcome to have a go at it.
> >
> > My experience with soundboard coatings has
> convinced me that the physical
> > characteristics of the finish material are
> incidental to the soundboard's
> > performance until either their mass or stiffness
> becomes a significant
> > percentage of the whole. In the case of the epoxy
> coating the stiffness of
> > the soundboard system is increased (significantly)
> and mass is increased
> > (slightly). I can't see any common coating
> material on its own doing either.
> >
> > Del
> >
> > _______________________________________________
> > pianotech list info:
> https://www.moypiano.com/resources/#archives
> _______________________________________________
> pianotech list info:
https://www.moypiano.com/resources/#archives
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