Lock tite- wood epoxy

[Farrell]

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At the risk of sounding like I am of the opinion that there is only one =
type of epoxy worthy of use on this planet, I offer the following for =
your consideration.

>From my experience, the source of failure with epoxies in general, when =
they occur, is between the epoxy and the substrate being bonded - in a =
repair like a rim, it would be the epoxy-to-wood joint that can be of =
concern. An epoxy bond is a mechanical bond: the epoxy must penetrate =
the wood sufficiently so that after it hardens it will not work loose. =
You've all heard/seen/experienced an auto-body repair with "Bondo" that =
separates from the metal after some time. This is because a proper =
mechanical bond was not made between the Bondo (yes, I know, Bondo is a =
polyurethane-based product - but the analogy works) and the metal =
substrate. The same can happen with the epoxy-to-wood joint.

A thick, putty-like epoxy, simply does not penetrate a wooden surface =
well on its own.=20

Now in a low-stress joint like filling a divot in a piece of wood, the =
thick epoxy might work just fine. But be sure to moosh the epoxy into =
the wood a bit to be sure it will interlock with the surface fibers of =
the wood.

In a high-stress joint, an epoxy like West System with its various =
fillers really shines. The basic principal here is to wet wood surfaces =
down with an unthickened epoxy - you can watch as the epoxy soaks into =
the wood - if it soaks in fast, you may want to apply unthickened epoxy =
again - with end grain you will want many applications of unthickened =
epoxy until it doesn't take any more. Then you add your filler of choice =
and thicken it to whatever consistency is appropriate for the =
application and make your bond. Doing this "preparatory wetting of the =
surfaces" will yield an epoxy bond that quite simply will never let go.
=20
=20

----- Original Message -----=20
  From: Erwinspiano@aol.com=20
  To: pianotech@ptg.org=20
  Sent: Sunday, July 11, 2004 6:02 PM
  Subject: Re: Lock tite- wood epoxy


  In a message dated 7/11/2004 1:42:26 PM Pacific Standard Time, =
lclgcnp@yahoo.com writes:
    I just used some of this stuff, mixed with aniline dye
    powder, to replace a bit of rim molding on a 1925
    grand I am working on. Worked pretty well. Hard to see
    repair. I would, though, like to hear others'
    recommendations for such repairs. I am inclined to try
    the "Tootsie Roll"(TM) type epoxy putty, mixed with
    dye powder, next time.
         Thump
          Good idea. I've wanted to try it myself.
           Dale








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