Lock tite- wood epoxy

[gordon stelter]

Great advice! Thanks, Terry!
     Thump
--- Farrell <mfarrel2@tampabay.rr.com> wrote:
> 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. 
> 
> 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.
>  
>  
> 
> ----- Original Message ----- 
>   From: Erwinspiano@aol.com 
>   To: pianotech@ptg.org 
>   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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