[pianotech] epoxy problems

[Susan Kline]

I concur. That was a very informative post, Doug. I've saved it.

Susan Kline

On 11/13/2010 8:16 AM, Paul McCloud wrote:
> Doug:
> 	Please write an article about all the glues you've researched, with pros
> and cons for each.  You could include all the successes and failures by
> past experience.  Why not resell those adhesives, especially those hard to
> find ones.  Might be able to realize some extra income, too.  Sell them at
> conventions, or ?
> 	Anyhow, your information is very welcome.
> 	Paul McCloud
> 	San Diego
>
>
>> [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
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