Old Masters Wiping Stain is a cutting edge, robust interior oil-based stain for use on wood, fiberglass, coated metal and composition surfaces. This product is intended for interior use only. All surfaces must be clean, dry, and free from dirt, wax, grease, glue, and other contaminants or penetration and adhesion will be affected. Wood surfaces must be sanded smooth. Surface defects should be repaired with an appropriate patching material.