Why does oil not bead up on waxed surfaces?

Oil does not bead up on waxed surfaces primarily due to the differences in surface tension and adhesion. Wax creates a hydrophobic surface that repels water but can allow oil to spread out more evenly, as oil's surface tension is lower compared to water. Additionally, the chemical properties of wax and oil can result in poor adhesion between the two, preventing the formation of distinct beads. As a result, oil tends to form a thin film rather than distinct droplets on waxed surfaces.