Epoxy

[David Love]

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Del:

I have typically used West System epoxies but I am curious about your =
use of the clear coat epoxy  you describe below.  I use West System, =
among other things, to secure bridge pins when repinning an old bridge.  =
After cleaning the bridge cap, sanding out the string grooves, and =
renotching, I put a drop or two of epoxy into the bridge pin hole, dip =
the tip of the new pin in epoxy and tap it in.  As the excess oozes out, =
I take a fine brush dipped in lacquer thinner and spread the excess =
epoxy over the cap and into the notches to seal the wood.  After it =
cures I paint on a thin coat of permalon--I've gotten away from putting =
graphite on the bridge.  I am curious about the clear coat epoxy because =
it seems that it might be a better seal for the wood.  Will it serve the =
same function as a filler for small cracks as the West System?

David Love
  ----- Original Message -----=20
  From: Delwin D Fandrich=20
  To: pianotech@ptg.org=20
  Sent: January 02, 2002 7:48 AM
  Subject: Re: Epoxy



    ----- Original Message -----=20
    From: Farrell=20
    To: pianotech@ptg.org=20
    Sent: January 02, 2002 4:50 AM
    Subject: Re: Epoxy


    Roger Jolly (bless his heart) refers to West System resin as being =
"water-thin" (I sure hope I have not mis-quoted Roger!). I asked him if =
he were using something different than I. He said no. It is definitely =
not water-thin, but it is indeed quite low in viscosity compared to many =
of the thick epoxies. With no fillers added, it has the consistency of =
something like motor oil. I would say it is thick enough to not wick =
into things real well like thin CA can. But I use it for installing =
bridge pins - it works real well, easy to handle, and will creep into =
little cracks next to pins that are present in so many old bridge tops. =
And of course you can make it as thick as you want with the various =
fillers.

    http://www.westsystem.com/ =20

    What is your intended use?

    I have heard from others that a product called Epotec 301 (my spell =
checker suggested "erotic", but I think it is Epotec) may be thinner =
than West System resin. I have not tried it. I had the address, but I =
cannot find it now. Anyone have the address?

  I'm sure Epotec makes a fine product. But it sure is hard getting =
product information out of them.

  We have used WEST system epoxies since the early '70s with much =
success. They make excellent products. But when it comes to coating =
epoxies we use SystemThree (http://www.systemthree.com) Clear Coat =
Epoxy.=20

  To quote, "Clear Coat epoxy is a very low viscosity (thin) almost =
colorless epoxy system that has a long pot life and cures without amine =
blush. Unlike some of the so called penetrating epoxies, Clear Coat =
contains no solvent. Furthermore, it is a very strong system when cured =
whereas the penetrating epoxies have little, in any, strength or =
resistance to moisture." This stuff really is nearly water thin. It also =
requires an extended cure time--depending on the temperature from 36 to =
72 hours.

  Del



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