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In the Forum: Melquiades Amplifier
In the Thread: Superior electric binding posts
Post Subject: Hmmm...Posted by Paul S on: 2/5/2017
Jarek, to begin with, I hope it is understood that I was referring to joints that are already soldered, which means they have already been roughed up/burnished, then fluxed (at least in the case of thick wire, "fittings", or plate), and of course there is also acid/flux core in the solder. It's what I do after soldering that that I began with, namely scraping off the detritus that the soldering produces, and then pacifying the scraped, soldered area, and cleaning that with water., then drying it all before applying shellac.  I have never tried mixing shellac flakes with isopropyl alcohol, since I was taught to use de-natured alcohol. Whether this is a factor, I do not know, but I have not had the bubbling you describe. Again, one needs to get both the acid (flux) and the alkaline (neutralizer) and any water used for final wiping off the copper/tin before layering on the shellac.  I don't know if I mentioned it before, but another "trick" with shellac is to use multiple, thin layers rather than globbing it on.

Best regards,
Paul S

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