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 > > > > > > > > > ATTACHMENT part 2 image/png name=7CB43BC1-F2C7-41C6-9528-56F753AD6856sig.png > ATTACHMENT part 3 application/octet-stream name=sig.jsp __________________________________ Do you Yahoo!? Yahoo! Mail Address AutoComplete - You start. We finish. http://promotions.yahoo.com/new_mail
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