Hi Folks Thanks for all the comments. I dont think Protek is water based... but I will check out exactly what it consists of. As for whether or not it can change the quality/behavior... i.e. harmonics of bass strings... that is not in question here. I have measured clear and obvious changes in para-inharmonicities every single time. Whether or not one self choses to perceive a given change as positive or negative is of course another matter. As to experimenting on customers pianos.... I think I did mention I was experimenting on a few junkers laying around town... so that point is I think adequately addressed. The other bit was adding to bridge pins. I have been looking at alternatives to adding CA due to the problem of needing to remove strings to really do the job correctly. Protek here again does have a definite impact on the sound of a string so treated. Another thing which I think shows even better promise is Cellulose lacquer thinned to about 1/6th strength. Cleans up the sound every bit as good as anything else... and again raises questions as to what actually causes classic false beats. Thoughts on the long term impact of Protek or that of Cellulose lacquer on the wood of the bridge are also welcome Thanks RicB
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