Someone would want to sand eggshell paint generally for two reasons. The first has to do with enhancing the appearance of the paint by removing the tarnished, outer layer. The second usually comes in preparation for the application of a brand new coat of paint. If you need to sand eggshell paint, you need to know the proper materials to use and the appropriate technique in which to employ them, or you may accidentally damage the surface.
Clean any dirt or sticky areas from the surface using dish soap and a rag. Rinse the soap away with a damp rag.
Lightly sand the surface with pumice stone.
Wipe down the surface with a tack cloth.
Clean any dirt or sticky areas from the surface using dish soap and a coarse brush. Rinse the soap away with a damp rag.
Peel away any loose or peeling eggshell paint using your fingers.
Smooth any remaining loose or peeling eggshell paint by sanding it with 80 to 120 grit sandpaper.