<!doctype html public "-//W3C//DTD W3 HTML//EN"> <html><head><style type="text/css"></style><title>Re: [pianotech] CA glue for split fall ?</title></head><body> <div>At 14:18 -0500 09/04/2011, Ron Nossaman wrote:</div> <div><br></div> <blockquote type="cite" cite>...Given the low stress requirements and difficulty of getting glue into the joint, I wonder why shellac wouldn't work in this case, and be much easier to wick in to the crack with longer working time. Thin followed quickly by a thicker mix should wet the surface and draw the stuff in well enough, and the bond should be strong enough for this application.</blockquote> <div><br></div> <div><br></div> <div>At 11:26 -0700 09/04/2011, Joseph Garrett wrote:</div> <div><br></div> <blockquote type="cite" cite>I would strongly suggest you use the proper substance. <G> I would suggest using Clear Epoxy. A way to get epoxy to "wick" like CA, is to heat the area and use a heat gun/hairdryer to keep it that way, while using an artist's pallette knife to work the epoxy into the crack.</blockquote> <div><br> <br> </div> <div>Thank you both for the suggestions.  The shellac idea would work if I could guarantee the fall was never again going to be strained, but I can't -- people do funny things with falls when the grown-ups aren't around.  By luck today I discovered the likely cause of the crack (there's a shorter one at the other end that went right through and which I have already repaired in a similar way to that suggested by Joe, except that I used the proper substance, ie. hot hide glue <G>) but you will see from the picture that there is no simple way to get any glue right into the crack, especially since I can't bend it open enough, without splitting it right through to the name side, to work the glue in, not even with a very thin feeler gauge let alone a palette knife.  Unfortunately walnut (the substrate is solid walnut) doesn't tear very straight!</div> <div><br></div> <div>Since the piano is quite rare and valuable I think I'll built a rubber tunnel over the crack and force the glue in with pneumatic pressure.</div> <div><br></div> <div><br></div> <div align="center"><br></div> <div align="center"><img src="cid:p0624082bc9c79b8d9cb1@[192.168.1.66].1.0"></div> </body> </html>