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Unfinished wood products from suppliers may have oils or other contaminants from handling on the surface of the wood. This all needs to be removed as it will negatively impact how the stain will be absorbed. Rough wood will not accept the stain as well in that although it may turn out darker, it will be blotchy and uneven. All wood surfaces need to be sanded down smooth and free of any oils or contaminants. An orbital sander is an excellent choice for aiding in the process. Take your time and sand the wood well. Unfinished wood products from suppliers may have oils or other contaminants from handling on the surface of the wood. This all needs to be removed as it will negatively impact how the stain will be absorbed. Rough wood will not accept the stain as well in that although it may turn out darker, it will be blotchy and uneven. All wood surfaces need to be sanded down smooth and free of any oils or contaminants. An orbital sander is an excellent choice for aiding in the process. Take your time and sand the wood well. For tips on sanding do your homework. In brief, sand with the grain of the wood. Select the appropriate sand paper that is intended for use on wood, and that is not too course. Rougher wood needs to be sanded with course paper then again with fine paper to produce the best smooth finish. After sanding be sure to remove all wood dust from the wood surfaces.