Dave, The Wurlitzer (and Baldwin) approved mixture of silicone and VM&P Naphtha (1:8 ration works fine) has worked successfully for me on Wurlitzers of this vintage for years. I started my career with a Wurlitzer dealer in a humid area so I was able to really test this stuff myself. There were exhaustive studies by Wurlitzer on this that convinced me that the treatment was a very viable solution with no harmful effects on the action, cloth, or piano as long as the solution was not allowed on the strings or tuning pins. I normally remove the action and FULLY lubricate (saturate) all action centers. I would be very surprised if you did not experience immediate, long-term results. Kent Webb
This PTG archive page provided courtesy of Moy Piano Service, LLC