Hi Dale, Many of the old plates were shellac finished, it's easy to tell just moisten a rag with alcohol and rub an inconspicuous corner. Roger. At 12:14 PM 7/8/01 -0700, you wrote: > Thanks for the warning David > > I'll use a metal primer next time and then shellac coat if necessary. After >giving this much thought lately do you or anyone out there have any >definitive answers to 1. what was the original black undercoating was and >exactly and how it was applied ? 2 Don't you think that the original gold >coats were either shellac or varnish or both? Premise: I firmly suspect that >it is possible that whatever one might put over that old and at times >rather brittle finish could react over time and cause the finish in time to >peel off in sheets. I've seen a time or too, but not mine yet. All I'm >saying is that finish products and processes will come back to bite you in >the rear end when you'all least expect it! > I just sand blasted another plate that finish was chipping and flaking >off badly. It had been painted over once many years ago with some kind of >....... A new finish can not be put over that scenario successfully. > > Dale Erwin > > >----- Original Message ----- >From: "David Stanwood" <dstanwood@hotmail.com> >To: <pianotech@ptg.org> >Sent: Saturday, July 07, 2001 2:20 PM >Subject: Re: Fw: shellac sealer on plate yes yes yesYES > > >> >> WARNING! >> >> Years ago I used shellac as a sealer for plates and after a few years the >> finish started to crackle and in some cases peel off in sheets. I found >the >> solution in a product call Silicone Stop Sealer which was made by Mohawk. >I >> have two gallons left... but I called the factory and they put me through >to >> a chemist who told me that it is half shellac and half lacquer. >> >> The way I use it is to spray on as an undercoat then when it is quite dry >I >> spray Utilac gold in a spray can... this alas is discontinued as well. >Then >> I mix about 1/3 orange shellac with the silicone stop seal and overspray >the >> gold starting with a very thin coat then spraying until the right golden >hue >> is had... >> >> I love the look, warmth, and feel, especially in tungsten light.... >> >> I treat the Steinway action rails the same way and it looks almost like >> polished brass.....but without the eventual tarnish. >> >> Shellac reacts with metal and I had some bad experience mixing shellac >with >> the powder but I think some experimentation with lacquer/shellac is worth >> while... >> >> David Stanwood >> >> >From: "Erwinpiano" <Erwinpiano@email.msn.com> >> >Reply-To: pianotech@ptg.org >> >To: <pianotech@ptg.org> >> >Subject: Fw: shellac sealer on plate yes yes yesYES >> >Date: Wed, 4 Jul 2001 07:20:08 -0700 >> > >> >Very interesting post Mark Potter. Once again it may have taken me >another >> >decade to think of that all by myself but I catch on quick after a long >> >time! >> > Thanks >> > >> > DAle Erwin >> > >> > >> >----- Original Message ----- >> >From: bases-loaded@juno.com >> >To: pianotech@ptg.org >> >Sent: Wednesday, July 04, 2001 4:10 AM >> >Subject: Re: shellac sealer on plate yes yes yesYES >> > >> > >> >On Tue, 03 Jul 2001 21:43:09 -0700 "Diane Hofstetter" >> ><dianepianotuner@hotmail.com> writes: >> > Dale, >> > >> > Me too, I offer up my gratitude to all who suggested shellac! >> > After two coats of spray shellac, sanding in between all coats, and a >> >coat of gold enamel, the fish-eyes are gone and tomorrow I can put the >top >> >clear coat on. Whew! >> > >> > Diane >> > >> > >> > Hi Diane - >> > >> > I'm glad it worked out for you so well! Yet another alternative for >you >> >would be to mix bronze powder right in with the shellac and use that as >> >your finish, or at least as a primer/sealer coat that already has a >bronze >> >color. I have done it many times with good results every time. Use the >> >palest color of shellac you can find, though, as a dark shellac will >yield >> >a darker gold color when mixed with the powder. >> > >> > Shellac is a finisher's right hand man. >> > >> > Mark Potter >> > bases-loaded@juno.com >> > >> > >> >> _________________________________________________________________ >> Get your FREE download of MSN Explorer at http://explorer.msn.com >> >> >
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