[pianotech] epoxy problems

[Paul McCloud]

Doug:
	I was looking at the Weldbond on Amazon, and came across this review from
a user:

	"After trying several different grades and types of glue, Weldbond came
out on top for gluing original ivory key laminates back on to vintage piano
keys. The glue is thin and doesn't raise the laminate height, and bonds
very strongly. I tried other PVA glues, but they were thicker and slid
around longer. Weldbond bonds very well to the ivory and cleans up easily."

	Anybody here using this for key repair?

	Paul McCloud
	Sn Dgo


> [Original Message]
> From: Douglas Gregg <classicpianodoc at gmail.com>
> To: <pianotech at ptg.org>
> Date: 11/13/2010 7:41:31 AM
> Subject: Re: [pianotech] epoxy problems
>
> I have had an avid interest in adhesives since I did a term paper on
> them in advanced chemistry bach in 1962. Jeez that was a long time
> ago.  My wife calls my passion the "adhesive of the month club". I
> have a few favorites.
>
>  West System just came out with a very strong yet flexible epoxy that
> their techs could not even believe. It is G-Flex. It is a bit slow
> setting but great for things like rib repairs to soundboard or moving
> wooden parts under high stress. Usually strong adhesives that set slow
> and are strong are also brittle. Not this one. It has good penetration
> too.
>
>  As stated before about the green piano bridge, I like JB Weld and
> Marine Tex black for high compression resistance, machinability and
> heat resistance up to 240degrees F. It can be used to repair an
> autoclave door flange. Very little creep but it is a bit thick and
> won't penetrate too well unless warmed up.
>
> I use Weldbond for all kinds of things. I carry  a small bottle of it
> in my tuning kit.  It looks and handles  like Elmers white glue but is
> much, much better. It was designed to glue tiles on the space shuttle.
> It is great for wood. You can even glue wood to metal, glass,
> concrete, and plaster with it- or any of them to each other. It dries
> clear.
>
> An elastomeric that will stick to nearly everything including those
> molded high density polyethylene kids toys that resist any other glue
> including epoxy. It is the Welder. It works like a contact adhesive
> (rubber cement or Goop)  but is  stronger and will not yellow or
> become brittle like Goop. Great for gluing felt and leather. Fix your
> shoes with it too.
>
> Another that is a bit hard to find is a CA glue called PascoFix glue.
> It is anaerobic ultra pure medical grade CA glue. It can be used in
> dentistry. Anaerobic means that it sets quickly even without oxygen
> present, like tight fits, under water, inside the body, etc. It can
> glue where some CA glues fail miserably. It can even be used to glue
> rubber patches on tires. There is an accessory Pasco filling powder
> that can be piled up on a part to fill in a missing portion like a
> broken plastic part and then be polymerized with a drop of  the
> PascoFix. This polymerized powder (now a very hard solid) is very
> strong, can then be machined back to any shape and be as strong or
> stronger than the original part. I think the powder is acrylic powder.
>  This stuff is amazing. It has saved me a few times by reproducing a
> plastic part with missing portions that was otherwise unavailable.
>
> Happy gluing.
>
> Douglas Gregg BS, DVM, MEd, PhD, over-educated nerd
> Classic Piano Doc
> Southold, NY