No, we do not recommend or encourage using a wood conditioner on the surface while using the Dark Tung Oil or Dark Half. Wood conditioners tend to fill in the pore structure of the wood and would prevent proper absorption of the oil. It’s also important to note that Dark Tung Oil and Dark Half are not stains. They do change the color of the wood but they highlight the natural grain structure rather than mask it like a stain. We recommend flooding the wood surface with a solvent prior to applying either oil to aid an even spreading of the oil for the first coat.