It revitalizes the natural structure, deepens the color of the treated surfaces, and results in an open-pored, satin-gloss, durable, and water-repellent surface that is largely free of yellowing. The universal hard oil is suitable for absorbent surfaces indoors, such as wooden floors, linoleum, and cork, stairs, exterior surfaces of furniture, Sterling OSB boards, and interior fittings. For mineral substrates, use Biofa Stone Oil 2100.