Years ago when I refinished pianos, we used rotten stone to break up the old finish before applying stripper...very rough stuff...don't know why the difference between the two... David Ilvedson, RPT Pacifica, CA 94044 ----- Original message ---------------------------------------- From: "Ric Brekne" <ricbrek at broadpark.no> To: pianotech at ptg.org Received: 9/1/2006 1:39:59 AM Subject: Keytops ?? :-( ... >Obviously you guys havnt been useing the right pumice then. French polishers use >something often refered to as rotten stone. Its pumice alright, but it roughly >equivilates to something in the neighboorhood of 1600 grit paper. 0000 steel wool is >very rough in comparison. In fact, if you use rotten stone with a bit of polisher you >can end up with more shine then you started with. But if you use it with action cloth >to buff off the shine.. you get this really nice satin finish thats flat it can be. >Cheers >RicB >............... >> I don't know, but it is something to think about. >> I suppose it would depend on the gauge of the scratches. I think that >> 600 grit would be less attractive to dirt, than 0000 steel wool. >> John M. Ross >I think that's it exactly. I tried pumice, which proved to be >too coarse and picked up dirt. I didn't have 800 grit paper >available anywhere locally that I knew of or I would have >tried that instead of 600. Probably still will (as apposed to >steel wool) when I get some. >Ron N
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