[pianotech] Restringing Liquid - Should Be Pindriving Fluid<G>

[John Ross]

Does Spar Varnish ring a bell with anyone?
John Ross,
Windsor, Nova Scotia
On 15-07-2012, at 5:54 PM, Joseph Garrett wrote:

> I remember reading on pianotech many moons ago, about a liquid Techs 
> use when restringing. It make it easier to knock the pins in but then it 
> sets increasing the torque. As the old search is no longer there and 
> I can't get my head round the new system. Anyone on here know what it 
> is called and what is in it
> 
> Thanks
> 
> Barrie,
> Essentially, pin driving fluid is nothing more than the base substance for
> Varnish, only without all the extra things that make it set up and be a
> specific type of varnish. A lot of those things are called "driers". Some
> of the added things work against what we want it to do, in this
> application. Our goal is to make the tuning pin go into the undersized hole
> with the least amount of trauma to the wood. Once the pin is in the wood,
> it needs to provide a smooth friction interface between the tuning pin and
> the wood. Or to put it another way, to provide a controllable, (if that is
> really possible<G>), friction in regards to consistantly drilled holes in
> the pinblock material. What we don't want is "poppy" tuning pins. Another
> thing that the pin driving fluid does, is to seal the wood, so that it is
> less reactive to humidity changes. If regular Varnish is used, (with all
> it's extra additives), It's been my experience that the end result will be
> inconsistant torque and "poppy" pins. 
> I used to get my pin driving fluid from Rhodda Paints. They no longer make
> Varnish, so they no longer have that particular base in stock. I still have
> some. It's almost20 years old. I am noticing a change in its composition
> and ability to do what I want it to. I suspect when it goes South, I'll
> simply go to the drilling system that Nossaman uses. (with perhaps
> something to swab the holes with, which I have not clue what, at this
> point.<G>) There other paint manufacturers that still make Varnish. You'll
> need to, directly,  contact their Laboratory, to get the base substance.
> One of those manufacturers is Miller Paints. I'm sure there are others.
> Hope that helps.
> Joe
> 
> 
> Joe Garrett, R.P.T.
> Captain of the Tool Police
> Squares R I
> 

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