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Hand Sanding and Staining Once the stripping has been completed, the piano is then sanded by hand with 120-grit sandpaper. The type of finish, i.e., either ebony or natural determines the shade to which the veneer is sanded. A piano receiving a natural finish is always sanded to an even and uniform color. The next step is the application of a high quality, paste wood filler. The purpose of this procedure is twofold: first, in the case of natural finishes, the filler adds color to the veneer--those customers receiving a natural finish are requested to approve a color sample before any further work is performed; second, the paste actually fills in the pores of the piano's wood.
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