After numerous light coats of shellac on walnut, I'm unable to remove the light residue from the pores from either: dry sanding with 1000, wet sanding 1000, gray or white pads. The shellac leaves residue in the pores that I can't wipe out with a wet rag or by vacuuming. To remove them I have to recoat. The problem is the sheen isn't PERFECT, so I still need to buff the final coat. I tried wet pumice (dark gray) but the sheen isn't what I want.