Hello Ron, I had almost a year of dealing with several (2-3) fog machines going on simultaneously during my stint with a touring pianist. The Baldwin SF ( BTW- is it "Baldwin day"????) didn't show much voicing damage .. to me it just showed the fingerprints more on the case. I wouldn't worry too much about it, but like you, I did worry about these things when I first saw it. I think a one time use of this should cause no problems for you. The fog machine we used worked by pouring mineral oil ( I THINK) into the unit. The piano seemed ok- but my hair!!! was another story. :) michelle stranges@oswego.edu
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