Spills will simply pool on top of the boards. The pre-finished boards are sealed on all sides with polyurethane to protect them. In addition to this the floor is clamped up tight when laid. The sanded and polished floors have a coating over the entire surface. Both finishes help protect the raw material from absorbing such spills, however, all spills should be cleaned up as soon as possible. If the polish layer is removed the floor will be more susceptible to potential staining.